This report explains how wicking beds can help safeguard future food supply by saving water, improving soil quality, using nutrients more effectively, and embedding atmospheric carbon into soil. It also shows an unexpected benefit: linked wicking beds can act as drainage in flood conditions, helping crops survive long waterlogging. The main challenge has been cost and labour, so the trials focus on low-cost, large-scale installation methods suited to farmers and orchards.

Summary

Wicking beds have multiple benefits: they grow crops with limited water, improve soil quality, make better use of nutrients, and have the potential to absorb large volumes of atmospheric carbon. They also have significant potential to both reduce climate change and help growers adapt to the flood–drought cycle that is expected to increase with climate change. The major downside to date is that wicking beds are labour intensive to construct, which has largely limited adoption to environmentally sensitive growers operating on a small scale. The aim of this project was to develop a way of installing wicking beds cheaply and easily on a large scale by converting an existing orchard into multiple linked beds. Because pipes are one of the major costs, alternative low-cost flow paths were trialled using wood chips, bamboo, sticks covered with film, and bubble wrap. All systems were effective if slow fill rates were used, so final choice becomes a practical issue of cost, raw material availability, and ease of automation. Water-use efficiency has been well established, but long-term drought conditions ended with extensive flooding during these trials, preventing a clean productivity comparison. However, an unexpected and important benefit was observed: linked beds provided drainage that reduced long waterlogging of roots, helping plants survive conditions that would normally destroy crops.

Background

The world population continues to increase and is expected to rise toward nine billion within the next fifty years, placing greater pressure on food production resources. Historically, agriculture in developed countries has steadily improved efficiency by roughly 2% to 3% per year, which has more than compensated for population growth in the past. Climate change alters that equation. The expected increase in the flood-and-drought cycle will require farmers to adapt to more violent and less predictable weather. Australia provides a clear example: years of drought reduced food production; then drought-breaking rains produced some of the best crops in years, only for many to be destroyed by floods and heavy rains. This shows that flooding can be as devastating as drought. Food production is therefore the critical issue in climate change. Wicking beds can both reduce atmospheric carbon levels and help growers maintain food production through more violent flood-and-drought cycles, but to be effective they must be adopted at scale, which means making the technology cheaper and easier to implement. This document is a provisional report of trials aimed at low-cost, wide-scale application.

Technology Basics

Wicking bed technology was developed over ten years earlier to solve a specific problem: lack of rain during the critical period when seed heads fill. The basic concept is an underground water reservoir lined with plastic sheet that fills with water and wicks upward into the root zone above. A second generation placed waste organic material into the reservoir, so it slowly decomposed and plants fed on a nutrient-rich compost tea. A third generation added inoculants of fungi and worms, coupled with nitrogen to control decomposition, further improving soil quality and production. These steps made it clear that wicking beds are also an effective way of embedding large volumes of atmospheric carbon into soil. Plants already absorb many times man-made emissions, but most of that carbon is rapidly returned to the atmosphere; controlled decomposition inside wicking beds embeds carbon into soil, providing a practical pathway for reducing atmospheric carbon while building fertility. The technology is widely adopted by environmentally sensitive growers but mainly on a small scale. Widespread adoption requires solving two key problems: developing low-cost large-area application and achieving acceptance for carbon trading so growers can be paid for absorbing carbon. The report notes the scale this could reach: for example, China could theoretically offset its entire emissions if about 17 million hectares were converted, around one third of China’s irrigated farmland, and widespread adoption by developing countries could create large volumes of carbon credits traded into emitter nations.

Aims of the Research Project

The aim of the research is to find a method of applying wicking beds to large areas at an economic price and to establish a mechanism for carbon trading involving millions of small growers worldwide. Low cost plus carbon-trading revenue would make it economic for farmers currently using flood irrigation to upgrade. This matters because flood irrigation is one of the largest users, and wasters, of water globally.

Early Conclusions and Direction

Several options exist for large-scale application. Multiple beds can be linked together using beds along the contour, with interconnecting lines down the slope. Automation is needed to create beds at scale. The most promising approach described is a simple rotating wheel attached to a tractor’s three-point linkage that digs a trench along the contour, lays plastic film, places low-cost flow channels (bored bamboo or sticks), covers them with a narrow plastic strip as a dirt shield, fills the trench with organic waste, then grades the surface. A second set of trenches down the slope can be lined with pipe (plastic or bamboo) and shaped with a small hump to divert flow into the contour trenches. Another possibility is ploughing bubble wrap into soil with a modified pipe layer. A major advantage, beyond irrigation, is the drainage component during flooding.

Trials: Site and Typical Bed Construction

Trials were carried out at Kookaburra Park Eco Village near Gin Gin, close to Bundaberg in Queensland, a region nominally classified as the dry subtropics. Traditional wicking beds had been built previously, typically single beds up to 20 metres long and 1.5 metres wide, which is convenient for vegetables and access. A 90 mm stormwater pipe is commonly used to distribute water along a bed. It is highly effective, but pipe cost (noted at around $4 per metre) becomes uneconomic at large scale, so alternatives were explored.

Alternative Flow Channels

Several alternatives to plastic pipe were trialled. Hollowed bamboo covered with PE film performed very well but is not readily available in Australia. Random sticks (prunings) about 0.5 m long, covered with PE film, provided an irregular but still effective flow path, although collecting and laying them is time consuming. Folded bubble wrap (allowing flow between bubbles) had lower flow rates but was better suited to automation. Sticks laid onto bubble wrap with the wrap folded over the sticks gave very efficient water transport and required only a few sticks. Open fills such as wood chips were also tried alone or in combination.

Linking Beds Together at Orchard Scale

A core goal was to link many beds so multiple beds could be irrigated simultaneously at an economic scale. The concept used was an area around half a hectare per system, such as linked beds 50 m wide over 100 m long. An existing orchard was used, containing mature citrus (grapefruit, orange, lemon) and younger mango, lychee, and other subtropical fruits. Ideally, beds sit along contour lines, but the existing trees were not perfectly on contour and bed lengths varied, reflecting the real-world constraints likely in practice. The approach began by digging contour channels with minimal slope (similar to furrow irrigation but essentially level) and connecting them using slope channels down the incline. A simple earth hump (plug) was used to partially block the slope channel below each junction so water would hit the hump, fill the contour channel, then overflow the hump and continue down the slope to the next contour. During a period when work paused due to surgery, the system operated as contour furrows and performed well largely because the heavy black clay was impermeable; in more porous soils, infiltration losses would be much higher. A flow rate of 20 litres per minute was used to fill channels in the clay. After recovery, channels were converted to wicking beds by lining them with plastic film. Practical constraints meant channels were not perfectly shaped and a “perfect fit” film approach proved impractical. A workable method was adopted: cutting film wider than required, placing the flow material, partially filling with organic matter, filling with water, then “crunching” excess film down to level by foot. This is crude but effective under constraints. Slope channels were converted to pipe using 50 mm corrugated pipe, with inlet and outlet arranged to match the wicking bed plastic level and seal against film near the earth hump.

Findings: Hydraulics, Flooding, and Flow Rates

The original plan was to test hydraulics and then monitor plant growth and productivity. However, the trials moved from the normal dry season into heavy rains, with frequent storms over 200 mm in a day. This revealed that the linked wicking beds provided excellent drainage after floods. While 200 mm in a day creates sheet flooding that no system can instantly remove, many plants can tolerate short immersion if water drains away quickly. Long immersion kills most plants, so post-flood drainage can be the difference between survival and loss. High-flow stick systems transported water at far higher rates than the initial 20 L/min, allowing contour channels to fill and then divert full flow to the slope overflow pipe. Bamboo performed even better but is scarce locally. Bubble wrap and wood chip channels had greater resistance and could not handle 20 L/min; water overflowed to slope pipes before contour channels filled, and the small head feeding the 50 mm pipe was inadequate, causing overflow. Reducing inlet flow to 5 L/min solved overflow and allowed low-flow channels to fill properly. One channel filled with wood chips without a PE liner failed at low flow because leakage was too high; the basic flood irrigation principle of “get water on fast before it soaks away” is incompatible with unlined channels at low flow. A channel using bubble wrap (folded as a flow path) backfilled with virgin soil worked well and is attractive because it can be automated using a modified pipe layer, although it does not directly leverage organic material to improve soil and embed carbon; other methods may apply organics separately. Traditional open furrows proved problematic for weed control machinery, so they were converted to organic-filled wicking beds.

Open and Closed Wicking Beds

Wicking beds can be closed or open. In a closed system, plants grow in the bed and have easy water access, but the system suits shallow-rooted plants such as vegetables. In an open system, deeper rooted plants grow beside the wicking bed; water wicks upward and then moves sideways and down to the root zone. These trials mainly used open wicking beds. One bed used a combination approach: a wider bed (about 1.5 m) growing vegetables with fruit trees growing just outside; this improved land use and proved successful. Most other beds were narrower (about 0.5 m) and used purely for irrigating trees. A cover crop was also grown in and around beds for weed control, which is critical in hot dry subtropical climates where periodic heavy rains encourage weeds and insects. Aggressive cover crops (creeping grasses or legumes) outcompete weeds and improve soil quality. The report also notes another benefit: while surface tension in wicking action is relatively weak and depends on pore size and soil chemistry, plants generate much stronger forces through transpiration. As water evaporates from leaves, it pulls water upward through capillary chains; these forces are strong enough to lift water many metres. At night the driving energy stops and water can flow back down through easier paths, creating a diurnal cycle that can move meaningful quantities of water over distance and between plants.

Which System Appears Best?

Several practical options emerge. The simplest is to line a channel and fill it with waste organic material. This reduces flow, limiting bed length and requiring more slope lines. The most cost-effective system, where cheap labour and abundant prunings or bamboo exist, is a liner with bamboo or sticks covered with film, giving excellent flow characteristics. Bubble wrap systems are the easiest to automate over large areas.

Adapting to Climate Change: Two Scenarios

In an ideal world, wicking beds could absorb emissions through international trading, with developing countries absorbing carbon and selling offsets to developed nations. This is technically and socially attractive: it helps solve emissions and improves balance between rich and poor. However, there is a second scenario: no international agreement, leaving growers to adapt to climate change, particularly an intensified flood-and-drought cycle. The Gin Gin region already experiences erratic rainfall and high evaporation, with long dry stretches and small showers that evaporate without penetrating soil. Useful rain often arrives as “freak rain,” commonly the tail end of cyclones producing around 200 mm in a day over a few days, followed by blue skies and high evaporation. Growers adapt using swales on contour lines to slow and capture water; trees are often planted on ridges to avoid waterlogging in heavy soils so plants keep some roots dry and recover after floods. Farmers are opportunistic, growing when conditions are good and leaving land fallow in drought. Dams, leaky dams, swales, spillways, and deep-rooted grasses are used to store water, slow runoff, recharge water tables, and reduce erosion. These approaches can manage a normal flood–drought cycle reasonably well.

An Exceptional Year and New Problems

The year of the trials was not normal. A severe drought had lasted around ten years, among the longest on record. Local dam systems that cope with several-year droughts were inadequate for drought of that length. Drought usually breaks with a major storm and short flooding that fills dams. But the pattern experienced was different: a long drought followed by a series of severe storms, with heavy rain even between storms. This meant ground stayed continuously saturated for long periods. In some locations, where drainage was inadequate, plants died from continuous immersion. There is little you can do to protect against 200 mm per day sheet flooding, but what matters is how quickly water drains away afterwards. The wicking bed areas drained in about ten hours, while other areas remained flooded for days. Excessive rains were disastrous: some of the best crops in years were ruined after farmers had already paid costs for seed, fuel, and fertiliser. Wet ground made machinery access difficult, weeds exploded, and high humidity created major problems with rusts, fungi, and rots. Vegetables bolted rapidly and became unusable. These are the kinds of new problems growers may face as climate change intensifies. Wicking beds were developed to grow crops with limited water, but the accidental discovery of strong drainage capability may prove equally important for adapting to the flood-and-drought cycle.

Conclusions

Climate change and increased flood-and-drought cycles present a severe threat to future food production. Wicking beds have the potential to mitigate climate change by embedding large volumes of carbon into soil, but doing this at scale depends on international agreement and the ability to provide independent scientific evidence to negotiators. If there is no effective international accord on atmospheric carbon, agriculture will still have to adapt to harsher cycles. Wicking beds use less water, can store water for short periods, and now appear to offer meaningful drainage capability, providing a way to adapt to adverse conditions. The report suggests that previous limitations of large-scale installation cost can be overcome. A twin research approach is required: scientific data on carbon absorbed and continued refinement of low-cost, large-scale application technology. If these objectives are met, the system may contribute to what has been described as the greatest moral challenge of our age.

Anticipatory irrigation is a practical, common-sense approach to watering crops more efficiently by working with rainfall, soil behaviour, and evaporation rather than against them. Instead of reacting too late or overwatering, this method focuses on getting water deep into the soil when conditions are right. The result is better use of small rainfalls, lower evaporation losses, healthier plants, and far more reliable irrigation scheduling using simple measurements and feedback.

What Is Anticipatory Irrigation?

Anticipatory irrigation is a simple method designed to achieve two main goals at the same time: making use of smaller rainfall events and minimising evaporation losses.

The basic aim is to get water deep into the soil profile where it is protected from evaporation and available to plant roots over a longer period.

Thresholds in Soil and Water

Just as there is a threshold level for runoff in dams, there is also a threshold amount of irrigation
water that must be applied before water penetrates into the deeper layers of soil.

The surface soil always has an insulating crust. This crust must be wetted out first, and all the water used to wet this surface layer will usually be lost to evaporation within a few hours.

Experienced irrigators know that enough water must be applied to fill the soil profile. Doing this extends the time between irrigations and reduces the repeated losses associated with wetting the surface again and again.

Why Timing Matters

What is less obvious is that the best time to irrigate is often just after a rainfall event. When rain has already wetted the soil surface, a much smaller volume of irrigation water is needed to push moisture deeper into the soil profile.

In this way, even small rainfalls become useful. Instead of evaporating quickly, they act as the first stage of filling the soil, allowing irrigation to complete the job efficiently.

Different Situations, Different Responses

There are times when rain is expected, but plants need water immediately. In these cases, the goal is not to fill the entire soil profile, but simply to apply enough water to meet short-term plant needs.

At other times, extreme heat may be forecast. In these conditions, it can be far better to irrigate ahead of time rather than irrigate during peak heat when evaporation losses are highest.

Common Sense Meets Measurement

All of this sounds like common sense, and it is. However, applying it consistently requires knowing how much water is needed to fill the soil profile.

The Limits of Soil Moisture Probes

Soil moisture probes are widely used to measure moisture levels, but they have two major limitations.

First, they only measure moisture content in the immediate area around the probe. Moisture varies widely throughout the root zone, so readings can change significantly depending on where the probe is placed. Experts attempt to position probes in an “average” location, but in practice this is far more difficult than it sounds.

The Bigger Problem: Wetted Volume

A more serious issue is knowing how much of the root zone has actually been wetted. Irrigation systems never apply water uniformly. Only part of the root zone is wetted at any one time.

This makes it extremely difficult to calculate total soil water content from a few sample points.

An Apparently Impossible Problem

This leaves us with what appears to be an impossible challenge: how do we calculate the total amount of water in the soil using only a small number of measurements?

The Simple Jar Analogy

The solution turns out to be surprisingly simple. Consider a jar filled with stones that is already partially filled with water. The problem of soil water measurement is exactly the same as this jar.

A water expert might be tempted to use probes, estimate the water between the stones, and calculate how much more water is needed to fill the jar.

The real solution is almost childlike: simply measure how much water is required to fill the jar. That measurement tells you exactly how much water was missing.

Applying This Idea to Irrigation

We apply the same idea to irrigation scheduling. First, we fill the soil profile and use soil moisture probes
to confirm when the profile is full. More specifically, we determine how much water must be applied
for moisture to reach the bottom of the root zone. We do not need to know how much water is in the soil at that point; we simply define that condition as “full”.

Letting the Plants Do the Measuring

Next, we allow the plants to use some water. Again, we may not know exactly how much water they have used. But we can measure it indirectly by refilling the soil profile.

The Practical Snag

There is one practical difficulty. It can take a long time for water to soak down to the base of the root zone. We cannot simply keep applying water until the profile is full, as this would introduce large errors.

Making an Educated Guess

The solution is to make an initial estimate. We guess how much water has been used by estimating a crop factor and multiplying it by evaporation. We then apply that estimated amount of water.

Refining the Estimate

We do not even need to start with a full soil profile. We begin with a guessed crop factor, apply the estimated water, and measure the irrigation depth. We then adjust the crop factor until, after applying the estimated water, the profile is again full. Once this is done, we know at any point how much water is needed to fill or partially fill the profile simply by looking at evaporation data.

Predictor–Corrector: Making Guessing Efficient

Guessing alone would be inefficient, but the process becomes very effective when combined with a mathematical technique known as a predictor–corrector method.

This method is built into a simple software program that continually refines estimates based on measured results.

Basic Theory

To manage irrigation effectively, we need to know two things: how much water plants are using, and the maximum allowable deficit in the soil.

These values are site-specific and must be learned through monitoring.

Learning From the Site

We cannot measure these values directly, but we can learn them over time by observing how the soil and plants respond. We start by making cautious estimates of crop factor and allowable deficit.

Daily Decision Making

Evaporation is measured, and the current deficit is estimated using evaporation and the current crop factor. This is compared with the allowable deficit to decide whether irrigation is needed.

Adjusting After Irrigation

After irrigation, soil moisture or irrigation depth is measured once water levels have stabilised. This information is then used to adjust the crop factor.

Stabilising the System

When the crop factor becomes stable, the onset of plant stress can be observed to determine the allowable deficit.

Why This Approach Works

Anticipatory irrigation avoids the trap of chasing exact soil moisture values. Instead, it focuses on refill amounts, timing, and feedback. The result is better use of rainfall, lower evaporation losses, healthier plants, and more reliable irrigation decisions.
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Conclusion

Anticipatory irrigation combines practical observation with simple measurement and feedback. It recognises that timing matters as much as volume.

By filling the soil profile efficiently and adjusting decisions based on real outcomes, growers can reduce water waste, make better use of rainfall, and irrigate with confidence rather than guesswork.

Soil BioPacks were created to make soil biology practical for ordinary growers—so we can grow vegetables that are not just “big and green”, but genuinely nutrient-rich. This article tells the behind-the-scenes story: the delays, the lessons, and the hard realities of working with living systems. If you want tidy beds, chemical quick-fixes, and zero weeds, this is not for you. But if you want minerals, biology, and better food, read on.

The Soil BioPack Story — A Behind-the-Scenes Look

At long last, Soil BioPacks became available. From the outside they look simple—just a box of soil—but that simplicity hides a lot of learning.
Developing BioPacks was not as straightforward as it looked at first. It was a challenge, but also educational, so this is the story—warts and all.

A Warning Before You Start

Before you even think about buying a Soil BioPack, you need to decide whether growing with soil biology is really for you. Most of the world’s food is produced through chemically based monoculture. In one sense it is efficient: it produces food in bulk at low cost. The negatives are less obvious until you look closely—food can be short of trace minerals that matter for health, and produce is often picked before it is ripe, so plants do not have time to build many of the phytochemicals that help keep us well.

Organic farming recognised the dangers of excessive chemical use, but too often the emphasis has been on “avoiding toxins” rather than on the positive goal: improving health by improving the nutrient content of food.

What “Growing With Soil Biology” Is Trying to Do

Growing based on soil biology aims to increase mineral content and the important phytochemicals needed for health by relying on living soil to do its job: fungi, bacteria, worms, and the rest of the ecosystem release minerals that are otherwise locked up, and plants can ripen naturally and be eaten soon after harvest. The principles are good—but there are serious practical issues that must be stated up front.

The Practical Realities (That Many People Don’t Want to Hear)

First: soil biology—especially the critical mycorrhizal fungi—is delicate. It is easily damaged by working the soil. These fungi are living creatures that need looking after. It is not simply “sprinkle a little powder and everything is solved”. A certain area must be protected as a permanent refuge for the biology, and disturbance has to be minimised.

Second: soil biology is a working ecosystem. That means abandoning the neat, clean soil and perfectly organised beds many growers take pride in. In a biological system, crops are often grown alongside host plants that support the biology. The right hosts should not compete with your crops, and may even assist growth. But if you are a “tidiness freak”, growing with soil biology is not for you.

Third: a multi-culture system with highly fertile soil is a natural magnet for weeds.
The usual herbicides used to control weeds can quickly destroy soil biology. This approach does not lend itself to mechanisation, so you may end up swapping “no-till energy savings” for hand weeding. In practice, hand weeding can become one of the biggest ongoing costs—whether the cost is time, money, or both.

Story Time: Why This Matters

Once upon a time—about forty years ago—I watched red clouds of soil spreading across the sky. Millions of tonnes of topsoil were being lost in dust storms. That sort of sight changes you. It makes you realise how thin the living layer really is, and how quickly it can be destroyed.

For me, the BioPack idea sits inside a bigger question: if we keep treating soil like an inert medium—just something to hold roots upright—what happens to the food, and what happens to us?

The Core Idea: A Controlled Ecosystem (Not Sterile Dirt)

The aim of the BioPacks is a controlled ecosystem where plants and soil biology work together, while competition from “the baddies” is minimised. Plants are not optional extras in this system—they are the engine. Their photosynthesis provides the energy and carbon (in sugars) that powers the whole ecosystem. You cannot have an ecosystem without plants: they bring in energy from sunlight and carbon from the atmosphere.

Looking for One “Perfect” Host Plant (And Why That Was a Trap)

At one stage I thought I just needed one ideal host plant—something that would host fungi and other biology, grow alongside crops, and spread in a manageable way without being invasive.

Gota Kola: The Mark 1 BioPack

I thought I had hit the jackpot with Gota Kola. It seemed to fit the requirements, and it has another advantage: it can form a living green ground cover around vegetables.

Many people like clean bare soil (or mulch) around their plants. I don’t like bare soil. Even mulch can feel like “wasted sunlight” to me. I prefer green mulch that uses sunshine to feed the soil. If soil biology needs feeding, the energy ultimately comes from plant photosynthesis—so why leave sunlight unused?

Gota Kola seemed ideal because it was not too aggressive: it could give ground cover without outcompeting other plants. That was the theory. In practice, I ran into a problem: I had real trouble growing Gota Kola in isolation, which was the original plan for the BioPacks.

I don’t fully understand the mechanism, but it seemed to need other plants nearby to grow well. In mixed plantings it could thrive—tomatoes growing happily in a clump of Gota Kola—but in “pure” plantings it struggled.

A Lucky Failure (And a Better Lesson)

In a perverse way, failing to grow Gota Kola “cleanly” was a success. It forced a learning experience: nature is not built around one magic plant that does everything perfectly. In the real world, Gota Kola often grows in combination with other plants—grasses and weeds included.

That failure shifted the direction of the BioPacks. Instead of hunting for one perfect mother plant for the biology, I began to accept what nature keeps demonstrating: combinations matter, and synergistic plant communities can outperform single-species thinking.

Why Plant Combinations Matter

I have always been an advocate of companion planting, even when the “why” was not always clear.
The BioPack work made the reason more obvious: different plants contribute different root structures, sugars, exudates, and micro-habitats. The biology responds to that diversity.

The challenge becomes selecting a combination of plants that work together—supporting fungi and microbes—without becoming weeds in their own right.

Tap Roots and Fibrous Roots (A Useful Simplification)

This may be too much of a simplification for some horticulturists, but I tend to think of plants as having either tap roots or mat (fibrous) roots. Gota Kola is a tap-root plant, and my hunch is that it benefits from having a fibrous-root companion nearby.

If you want to go deeper into root behaviour, “Roots Demystified” by Robert Kourik is a worthwhile read.

Keeping the “Baddies” Under Control

Any productive biological system attracts competition—pests, weeds, and soil problems that enjoy the same fertile conditions you are trying to create. This is why “controlled ecosystem” matters. The BioPack approach is not about building a wild jungle you can’t manage. It is about building a living system you can keep stable and productive.

Adding the Biology

Even if you start with biologically active soil, it may not be enough—especially in worked soils.
So the BioPack method uses both existing soil life and specialist inputs to build a working ecosystem:
mycorrhizal fungi, rhizobium bacteria, compost biology, and worms.

Mycorrhizal Fungi: The Key Plank

Mycorrhizal fungi are often the most deficient in worked soils because they are easily damaged.
They can also be the hardest part of soil biology to build up—yet they play one of the most crucial roles.
That is why they are a central plank of the BioPacks.

The approach has been to improve natural mycorrhizae in the soil and combine that with commercially available spores. The spores are introduced by dosing roots directly, then reinforcing the inoculation by pouring spore-containing water into holes leading down to the root zone. This continues until the fungi have clearly “taken”.

BioPacks are then cut from the bed in a way that disturbs only a small portion, so the plants and fungi can regenerate for the next batch. While the system matures, extra spores may also be added to individual BioPacks before distribution—a belt-and-braces approach.

Minerals: The Law of the Minimum

There is a basic law in plant nutrition called the law of the minimum: plant growth is restricted by the component in shortest supply, regardless of how much of everything else you add.

Modern fertiliser technology means plants are rarely limited by a shortage of N, P, and K. This has shifted attention onto secondary nutrients—but there is another reality: humans require a much wider range of nutrients, particularly trace elements, than plants do.

Commercially it is perfectly possible to produce great-looking vegetables that sell well, yet still fail to provide the minerals and complex chemistry—vitamins and phytochemicals—needed for human health. That is why trace elements and minerals are added into the BioPacks.

Two choices exist for mineral supply: cheap rock dust from a quarry, or custom blended mineral packs.
The blended packs cost more, but were selected because they have better structure and defined content.
Growers can still choose to add extra minerals into their beds via quarry dust or trace element packs, depending on their goals and budget.

Compost: Building Microbial Activity

Properly prepared compost is the most practical method of increasing microbial action in soil.
Quality matters. Compost made with careful management of biology—and supported with inputs like seaweed products—can be excellent for encouraging biological activity.

Commercial “compost accelerators” can add concentrated bacteria, but if you are already using high-quality compost with well-managed biology, extra accelerators may not be necessary.

Worms: Mobility for Biology

Worms play a critical role in improving soil texture and—just as importantly—distributing biology.
Bacteria breed fast, but they don’t have legs. Without larger mobile creatures, biology can remain stuck in one area. Fungi spread more slowly as they grow outward through soil.

Worm eggs are more reliable in transport than live worms, even though they take a few months to mature and begin breeding. The BioPack approach uses a blend of worms: traditional composting worms that tend to remain in one area, and larger highly mobile worms that act as excellent carriers of soil biology.

Packaging and Distribution: The “Minimum Size” Surprise

One of the unexpected issues in developing BioPacks was postage. The original plan was smaller packs to keep postage cheap—after all, these are inoculants. But here was another learning experience: there is a minimum size for a viable ecosystem.

The pack size was upgraded to a 152 mm cube which, with some vermiculite, can be kept within the 3 kg limit. Posting fully grown plants with foliage turned out to be impractical. The contents get shaken and mixed in transit—sometimes it feels as if Australia Post has a special vibrating machine for the job.

The practical solution has been to trim plants to the top of the box and pack the remaining foliage in vermiculite so the box is tight and stable. This can disappoint people who have seen pictures of BioPacks in full foliage, because the box may arrive with no visible plants. But with water and sun, plants quickly refoliate.

Supply, Pricing, and How BioPacks May Be Delivered

At the time of writing, BioPacks were being shipped directly to customers. The pricing model described was $28 per BioPack, plus $15 postage, plus an extra $3 for each additional BioPack. Payment options included direct transfer (with account details after order confirmation) or PayPal.

Distribution through coaches was seen as an ideal pathway, because customers could see the ecosystem at work. Better still, coaches could incorporate a Soil BioPack into completed wicking beds offered for sale, so the buyer receives a system that begins with biology, not just a box of dirt.

The Final Point

The technical details—fungi, minerals, compost, worms, packaging—matter. But they should not distract from the main objective: growing systems that help ordinary people produce genuinely nutrient-rich vegetables, by rebuilding soil biology rather than trying to replace nature with quick chemistry.

Gardening Australia recently showed how to build self-watering containers and asked people to focus on water saving. Colin Austin agrees the design works, but says it risks missing the real benefit of wicking beds: improved nutrition. Modern farming produces cheap, good-looking food, yet often strips soils of minerals and trace elements essential for human health. Wicking beds can help by making it easy for anyone to grow nutrient-dense vegetables using mineral-rich living soil, strong biology, and proper “breathing” to prevent stagnant, smelly reservoirs.

Technically Correct, But Maybe Missing the Key Point

Recently Gardening Australia ran a segment on how to make self-watering containers and people have asked me what I think.

For a start let me say that I am delighted that such a well watched program as Gardening Australia is giving prominence to wicking beds — it is very satisfying to see how rapidly they are spreading. There is no doubt that technically the system promoted — using stones covered with a cloth — does work. It extends the time between watering and it does save water.

But my question is: does focusing on water saving mean that we are really missing the key point? I, more than most, must be sensitive to water saving, but there is a much bigger issue.

Modern Agriculture: Cheap Food, But “Goodness” Leaves the Soil

Modern agriculture is very efficient and produces a lot of food very cheaply, but ongoing crops take the goodness out of the soil. Farmers are very good at knowing how much fertiliser to apply to renew their soil to produce good looking plants, but while the plants may look healthy they may not contain the critical ingredients which are important for our health.

For example, plants have no need whatever for trace elements like iodine and selenium, but they are essential for us. Selenium is believed to play a critical role in our DNA correctly reproducing our cells. The amount needed may be very small but they are critical. The excess of calories but lack of nutrition in our food is causing major health problems around the world — obesity, diabetes and heart problems.

Why We Need Improved Nutrition

I have selected just one quote from the medical profession, in this case by Georgia Clark-Albert who is a diabetic specialist, but the theme is widespread.

“I remembered back to my graduate and undergraduate nutrition work, when the consensus was that if people were eating a healthy diet they didn’t need supplements. However, there have since been some changes to our diets:

• Fewer nutrients in our produce because of processing techniques.

• Faster-growing fruit doesn’t have time to develop nutrients.

• Monoculture farming practices leads to soil-mineral depletion.

• Selective breeding to increase crop yield leads to genetic dilution effect and declines in the content of protein and minerals.

• The average vegetable in today’s supermarket is five to 40 percent lower in minerals than those harvested 50 years ago.”

The Number 1 Benefit of Wicking Beds Is Improved Nutrition

Wicking beds provide a solution by providing nutrient rich food. They can be very simple; it is dead easy to make effective wicking beds at virtually no cost.

Just take a polystyrene vegetable box, often free from supermarkets; put a pipe down to the base and a hole in the side, fill with soil and “hey presto” there is an effective wicking bed.

So simple that anyone can grow their own vegetables. Plants like Kang Kong and water cress will keep on growing with virtually no attention other than occasional watering and feeding.

The Key Is the Soil: Minerals + Biology

Of course the key is in the soil. It must contain the necessary minerals — if the soil lacks minerals then so will the plants and so will our diet.

But it is not as simple as adding nutrients. Volcanic rocks provide an abundance of these essential trace minerals.

Soil biology is also needed to release the minerals and make them available to the plant.

Worms distribute nutrients, fungal spores and bacteria throughout the soil while at the same time making channels throughout the soil so it looks like Swiss cheese and holds much more water.

Soil biology needs feeding. Recycling waste food is a socially and environmentally effective way of feeding the soil biology which in turn increases our nutrient intake.

Think of Wicking Beds as a Mini Eco System

We need to start thinking of wicking beds as a mini eco system.

Plants and animals (that includes us humans) have evolved together in a mutually beneficial or symbiotic relationship. Plants provide us with vital nutrients and phytochemicals which are essential for our health. In return, animals distribute plant seeds far away from the host plants. Both animals and plants mutually benefit from this relationship.

We live in an era of astonishing technical development. Smart phones send terabytes of information around the world while genetics are breaking ground in improving health, but we still depend on balanced eco systems which have evolved over thousands of years to maintain our health. This concept of a mini eco system is the philosophy behind the development of BioPacks.

I would be more than happy to see Gardening Australia focus on the soils that go into wicking beds, as they are the critical issue.

Putrification and Soil Breathing

However there are some technical issues with using stones in a separate water reservoir. I have had people complaining that the water in their wicking beds goes smelly and putrid.

It is important that the water is cycled so the liquid water level drops (there is still plenty of water for the plants held in the soil even when the reservoir is empty) and is then refilled.

This gives a breathing action to the soil, expelling stale air and sucking in fresh air.

Using living soil as the water reservoir rather than inert stones means the roots grow throughout the bed.

In particular they can go down to the base of the box and extract all the liquid water so it never goes stagnant.

A Useful Feature: A Visible Drain Hole

I must admit I do like the visible drain hole which can be used as a sight gauge on the side of the box. This enables the water level to be adjusted by twisting the drain tube. Being able to see the water level reduces the temptation to keep on topping up with more water, which is the commonest cause of failure with wicking beds.

Stones vs Soil: Water Storage Is a Technical Issue

Some people argue that stones will hold more water than soil, and there is some truth in this.

Stones will typically have a pore space of about 30%. The pore space in the soil will depend on the state of the soil, but may only be 20% in a poor soil.

But if the water holding capacity is an issue — for example if the boxes are going to be left for some time between watering — then it is easy to increase the water holding capacity by laying pipes or some other container such as an old water bottle, in the base of the box.

These pipes do not contain any stones or soil so 100% of the space is available for water storage — much more efficient than using the pore space between stones as water storage.

A metre of 90mm storm water pipe will hold some 6 litres of water — the size of a small bucket — which together with the water in the soil gives a significant amount of stored water.

The Final Key Point

These issues about water storage are technical issues and should not draw attention away from the fact that wicking boxes, with the necessary soil, minerals and biology, enable anyone — including people with no gardening expertise or people living in an apartment — to improve their health by eating their own freshly grown vegetables.

Wicking beds are often promoted as a convenient way to save water and reduce the effort required to grow vegetables. While this is true, it only scratches the surface. In this Shanghai talk, Colin Austin explains how modern wicking bed technology can help address a much deeper problem: diets that deliver abundant energy but lack essential minerals, vitamins, and phytochemicals. When the body senses these deficiencies, it can drive overeating. Growing fresh vegetables in mineral-rich, biologically active soils provides a practical way to restore balance.

Introduction — Looking Beyond Convenience

Wicking beds are widely recognised as a clever gardening technique. The original idea was simple: place a waterproof layer beneath the soil so that water from rain or irrigation is trapped rather than draining away. This allowed crops to survive drought and reduced the loss of nutrients below the root zone.

This early form of wicking bed technology was developed mainly to provide basic food security in regions where water was scarce. It was a practical, low-tech solution that worked well, and it is no surprise that gardeners around the world quickly adopted it.

However, stopping at this point misses the real opportunity. Thinking of wicking beds purely as a labour-saving device is like thinking of the horse and cart as the ultimate form of transport. Modern wicking beds can play a much larger role, particularly in addressing some of the most serious health challenges facing modern societies.

The Modern Health Crisis

Across much of the developed world, rates of obesity, diabetes, heart disease, and stroke have risen dramatically. Diabetes alone has become one of the largest costs to public health systems, consuming enormous resources while continuing to grow.

When I first visited mainland China after Deng Xiaoping opened the country to the world, two images stayed with me. The first was the vast number of bicycles filling the streets. The second was how slim and physically active people appeared. Food was simpler, transport involved daily physical effort, and lifestyles were less sedentary.

Over time, prosperity brought major changes. Bicycles were replaced by electric scooters and cars. Diets shifted toward processed foods rich in sugar, fats, and refined carbohydrates. China is now the country with the largest number of people living with diabetes—over 100 million. This mirrors patterns already seen in Australia, the United States, and Europe.

An Abundance of Energy

Modern agriculture is exceptionally good at producing energy. Crops such as rice, wheat, corn, and soy have been selectively bred to maximise yield. The Green Revolution transformed food production, allowing the world to generate enough calories to feed far more people than currently live on the planet.

In purely energetic terms, hunger should no longer exist. Where people remain underfed, the causes are usually political instability, conflict, or failures of distribution rather than a lack of food production.

Yet alongside this success lies a fundamental problem. While energy is abundant, many diets are deficient in essential minerals, trace elements, vitamins, omega-3 fats, and plant-based phytochemicals. These nutrients are critical to long-term health, yet they are often missing from modern food systems.

Why Nutrition Advice Is So Confusing

Anyone trying to understand diet and health quickly becomes overwhelmed. Medical professionals, researchers, diet authors, influencers, and supplement companies all promote different approaches. One diet claims fat is harmful; another claims sugar is the problem; another insists carbohydrates should be eliminated altogether.

Many of these diets produce short-term results, only to fail in the long run. People lose weight briefly, then regain it. This pattern is so common that it is often blamed on a lack of discipline or motivation.

The real problem is not willpower. It is a misunderstanding of how the human body works.

The Body Is Not a Simple Machine

For a long time, nutrition research treated the human body as a simple engine. Put fuel in, get energy out. Reduce fuel, reduce weight. This approach assumes the body responds passively to food intake.

In reality, the body is an intelligent system. It produces neurochemicals—chemical signals from the gut to the brain—that constantly report on nutritional status. These signals influence hunger, appetite, cravings, and even mood.

When the body senses that essential nutrients are missing, it sends strong signals to eat more. These systems evolved over hundreds of thousands of years to protect survival, not to align with modern ideas of weight control.

How Humans Evolved to Eat

For almost 200,000 years, humans lived as hunter-gatherers. Most of the diet came from wild plants grown in virgin soils rich in minerals and supported by complex soil biology. Animal protein was consumed when available but was not the dominant source of calories.

These foods were generally low in energy but high in nutrients. The body evolved to cope with scarcity of calories, not scarcity of minerals and vitamins.

Agriculture began only around 10,000 years ago, and industrial farming is far more recent. In evolutionary terms, these changes happened almost overnight. Our biology has not had time to adapt.

Fertilisers and Soil Depletion

Plants require carbon, oxygen, and hydrogen from air and water, along with primary nutrients such as nitrogen, phosphorus, and potassium. They also need calcium, magnesium, sulphur, and small quantities of trace elements to function properly.

Humans, however, require additional elements such as selenium, iodine, chromium, and vanadium. Plants do not need these elements for growth, but they will absorb them if they are present in the soil.

Modern farming is highly optimised for yield. Farmers carefully apply nutrients that increase production, but they have little incentive to replace minerals that do not affect yield. Over decades of continuous cropping, these trace elements are slowly stripped from the soil.

Meat and Misplaced Blame

Rising meat consumption is often blamed for modern disease, but the issue is more complex. Animals raised on mineral-poor feed produce mineral-poor meat.

Wild animals and traditionally grazed livestock consume diverse plants grown on unfarmed land. Their meat is often far more nutrient-dense. The problem is not meat itself, but the way food systems are managed.

The Overeating Feedback Loop

When diets are rich in energy but poor in micronutrients, the body increases appetite. People respond by eating more of the same food, increasing calorie intake without correcting deficiencies.

This creates a powerful feedback loop. Diets fail because biological signals eventually overpower conscious restraint.

The United Nations Food and Agriculture Organization refers to this as “hidden hunger”: diets that provide enough calories but insufficient nutrients. Iron deficiency, iodine deficiency, and vitamin shortages remain widespread even in wealthy nations.

Why Supplements Are Not Enough

Supplements appear to offer a simple fix, but nutrition is not additive. Nutrients interact with each other, and absorption depends on food structure and biological context.

Taking isolated chemicals cannot replicate the complexity of real food. Supplements are expensive, incomplete, and often address symptoms rather than causes.

The Role of Phytochemicals

Plants contain thousands of phytochemicals that science is only beginning to understand. These compounds work together to support health in ways that cannot be reduced to single nutrients.

Health depends on diversity, complexity, and freshness.

False Shortcuts and Appetite Suppression

Some plants and drugs claim to reduce appetite by tricking the body’s sensing systems. While this may suppress hunger, it does not address the underlying nutrient imbalance.

Fooling the body is not the same as nourishing it.

A Practical Way Forward

The modern food system provides abundant, affordable energy year-round. It would be unrealistic and undesirable to dismantle it.

The solution is to supplement it with fresh, nutrient-dense food.

Wicking Beds as a Practical Tool

Wicking beds make it easier to grow vegetables with minimal water and strong soil biology. In Australia, many households already use them successfully in backyards and community gardens.

They also provide social benefits, reconnecting people with food production and with each other.

Urban Living and Space Constraints

Cities like Shanghai present unique challenges. Most residents live in apartments with limited growing space. However, balconies, rooftops, and shared areas can still produce meaningful quantities of nutrient-rich food.

How Wicking Beds Work

A waterproof base stores water beneath the soil. Moisture moves upward through capillary action, keeping roots evenly supplied. Periodic changes in water level allow air to move through the soil, supporting root health and microbial activity.

Soil Is the Core Technology

Soil is the heart of the system. It must be porous, biologically active, and mineral-rich. Worms, fungi, and bacteria convert minerals into forms plants can absorb.

Using the right soil allows roots to fully explore the growing volume and eliminates the need for gravel layers.

The YingYang He System

For China, the goal is to allow families to grow enough nutrient-dense vegetables to balance energy-rich diets. Fast-growing leafy greens, climbing plants, and compact varieties maximise production in limited space.

Chop and Chew Harvesting

Many plants can be harvested continuously by removing outer leaves. This “chop and chew” approach increases productivity and ensures a steady supply of fresh food.

Swap and Go Distribution

Plants grown in removable baskets can be swapped at local stalls. Families receive living vegetables without waiting months for growth, matching strong cultural preferences for freshness.

Conclusion

Wicking beds are far more than a gardening convenience. They provide a practical response to the mismatch between modern diets and human biology.

Our bodies are intelligent systems shaped by evolution. When food lacks minerals, vitamins, and phytochemicals, appetite increases. The solution is not willpower or pills, but restoring nutrient density to food.

By combining wicking bed technology, mineral-rich soils, active biology, and thoughtful urban design, it is possible to supplement modern diets with living, nutrient-dense vegetables—even in dense cities like Shanghai.

Introduction

Our food system has become extremely good at producing calories. Advances in agriculture, the green revolution, and market forces can create a surplus of energy-rich food that looks abundant and affordable. The problem is that this same system often produces food that is short of critical nutrients—minerals, trace elements, vitamins, and the phytochemicals that plants naturally contain.

When we eat a diet that is high in energy but low in nutrients, we can end up eating more and more, yet still not feel properly satisfied. The result is not just weight gain, but the slow build-up of chronic disease: obesity, diabetes, heart disease, and strokes. This article explains the “Ying Yang food” idea and the Ying Yang Food system—why it exists, how it works, and how it connects growing methods with ethical distribution.

The Modern Diet Problem: High Energy, Low Nutrition

The core issue is simple: the modern diet can contain an excess of energy (fats, sugars, carbohydrates) while being short of the nutrients that keep the body functioning well. Many people are not getting enough key minerals and vitamins, including calcium, magnesium, zinc, iron, copper, iodine, selenium, omega-3, and vitamins such as B6, B12, D, E, and F.

These deficiencies are not a small detail. They are the foundations of health. Minerals are required for the chemistry of life. Trace elements are often needed in tiny amounts, but they are still essential. Vitamins act like switches and catalysts across thousands of metabolic processes. If the diet consistently falls short, the body reacts.

The “Hungry Beast”: Why Deficiencies Can Drive Cravings

Research suggests the body has a highly developed signalling system of neurochemicals—chemical messages that sense deficiencies. When the body detects missing nutrients, it can create a kind of internal “hungry beast”. The person feels hungry and craves more food.

The trap is that people often respond by eating more of the same energy-rich food that caused the problem. So the body gets more calories, but still not enough of the missing minerals and vitamins. Over time, this mismatch can contribute to obesity and disease. It is a feedback loop: deficient food drives appetite, appetite drives overeating, and overeating often still fails to correct the deficiency.

Why “Just Take a Pill” Is the Wrong Model

A common response is: “No worries—just pop a few pills.” The logic seems practical. If the diet is short on nutrients, supplement them. But this approach can repeat the same mistake that created the problem in the first place: simplifying something that is deeply complex.

Our bodies are not simple machines. They are living systems shaped by evolution, and they respond best to food as a complex package of chemistry, structure, and biology. Trying to prop up dietary deficiencies with a few isolated chemicals can miss the wider synergy that real food provides. The aim is not to replace food with pills, but to fix the quality of the food itself.

Co-Evolution: Why Plants “Want” to Be Good Food

Animals and plants have been co-evolving over millions of years. In that time they developed sophisticated relationships based on complex chemistry. In early stages, plants formed synergistic relationships with soil biology, exchanging energy from photosynthesis for nutrients released by microbes and fungi.

Plants also had to defend themselves. They could not run away, so they became masters of chemistry. They developed toxic chemicals to protect themselves from predators, especially insects. Later, plants developed relationships with grazing animals. In these relationships, plants exchanged energy and in return benefited from nutrients and soil disturbance that helped seed propagation.

Later still, specialist plants—what we now call fruits and vegetables—developed relationships with smaller animals and early humans. It might not be obvious why a plant would evolve to be eaten, but in many cases both sides win.

Why Vegetables Help: Fibre, Waste Removal, and Seed Spreading

Plants evolved to supply a wide range of beneficial foods. These foods evolved to taste good so we would eat them. In return, humans and animals spread seeds and often provided nutrients.

Vegetables in particular act as natural laxatives. They contain a large bulk of fibrous material. This fibre can absorb toxic wastes from our bodies and help carry them out. Those wastes are then excreted near plants—returning nutrients to the system—and may even contain seeds that can pass through unharmed. Over long timeframes, this kind of loop supports both plant survival and human health.

It is no accident that people who eat a lot of vegetables are often thinner, fitter, and tend to live longer. The body has evolved around the chemistry and structure of plants.

Phytochemicals: The Chemistry We Cannot Replicate

Our bodies have evolved to eat plants that provide a wide range of complex chemicals—phytochemicals (beneficial chemicals produced by plants)—as well as fibre. These phytochemicals play crucial roles in human health.

Their complexity matters. Over a thousand different chemicals have been identified in a single tomato. Every type of vegetable provides a different mix of beneficial phytochemicals, far beyond the capacity of man-made chemistry to reproduce reliably.

This is why the goal is not merely “more food” or even “more supplements”, but better food: fresh plants grown in mineral-rich soils with active soil biology to release minerals and support plant chemistry.

 The Ying Yang Food System: The Technology

The Ying Yang Food system was developed to make fresh, nutrient-rich food—with the needed phytochemicals—available to anyone concerned about their health.

The Ying Yang team continuously looks for plant varieties that can provide critical phytochemicals. These plants are grown in soil enriched with the needed minerals in a wicking bed. In this system, the wicking bed is essentially a closed container that maintains a steady moisture level, allowing soil biology to thrive. The search for improved plant varieties, mineral sources, and soil biology is ongoing so plants can optimise their output of these critical phytochemicals.

Minerals, Soil Biology, and Recycling Food Waste

Minerals are brought in from outside, but many mineral sources are insoluble rocks. They are not directly available to plants in that form. The conversion happens through biology: fungi, bacteria, and worms can convert mineral sources into soluble chemicals that plants can take up.

But soil biology needs to be fed. One practical way to do that is recycling food waste. When food waste is returned to the growing system, it feeds microbes and soil organisms, helping build nutrient-rich soil. In that soil, selected edible plants can be grown and, when eaten fresh, provide the minerals and nutrients we need.

More Than Growing: An Ethical Food Distribution System

The Ying Yang Food system is not only a growing method. It is also designed as an ethical way of distributing healthy food.

To see why, consider the conventional food distribution chain. A farmer grows crops. Those crops may be bought by a supermarket chain or a commodity trader. They may then be sold to a food processor, then to a retail outlet, and finally to the customer.

In this conventional chain, the farmer has little financial incentive to add the required minerals to the soil. At the other end, the customer has no real assurance that the food contains the minerals, vitamins, and phytochemicals needed for health. The system rewards volume and shelf life, not nutrient density and verified quality.

How the Ying Yang System Solves the Incentive Problem

The Ying Yang system addresses these intrinsic weaknesses by bringing grower and customer together through a simple structure: an association of people who believe in the importance of healthy food.

People in this system naturally expect to be paid for their services, but there is no large intermediate company focused mainly on extracting profits. Instead, the system relies on trained and skilled people who can help both growers and customers. These people are called coaches.

Coaches are central because they hold the knowledge of which plants provide which health benefits, and they help ensure growing standards are met so the customer can trust what they are receiving.

The Coach Model: How It Works in Practice

A customer contacts a coach. The coach has a list of plant types and their health benefits. If the customer wishes, she (or he) may visit growers, see farms, and discuss which plants might best suit her needs. The customer chooses plants and places an order (typically through the coach) and makes a first payment.

Once the order is placed, the grower is under contract to grow the plants using the methods agreed with the coach and the customer. The coach has responsibility to ensure the grower follows those agreed methods.

The coach also arranges for the soil to be tested at an independent laboratory. Based on the results, the coach supplies the grower with required minerals and nutrients. The customer receives an independent certificate confirming soil nutrient levels, giving real assurance of quality rather than vague claims.

Living Food: Removable Baskets and “Chop and Chew”

One beauty of the Ying Yang Food system is how plants are delivered. Plants are grown in removable baskets that sit in the soil, not directly in the soil. This means the customer receives living, growing plants in the basket.

This is not like a supermarket where the plant has already been harvested. With living plants, fruit or leaves can be harvested and eaten totally fresh. The recommended approach is the “chop and chew” method: take some leaves from the living plant and consume them. The plant regrows new leaves, giving a continuous supply of fresh food.

Flexible Delivery: Soil and Seeds to Fully Grown Plants

The basket system offers another practical advantage: the customer can take delivery at any time during the growing process.

Delivery might be at the end of the growing cycle when plants are ready for eating—virtually no work required. Or delivery could be when plants are seedlings, so the customer grows the plants herself. Or the customer can receive soil and seeds and look after the entire growing process.

This flexibility depends on the customer’s available space, time, and skills, often with advice from the coach. Naturally, the level of service is reflected in the price.

Some customers may find they can get higher quality food at lower cost than supermarket food if they do more of the growing themselves (and it is fun anyway). Others may prefer to leave the growing to professionals and pay a little more. The system is designed to support both approaches.

Widely Reported Deficits in a Modern Diet

The table below summarises two linked realities: (1) the elements plants need to grow well, and (2) the minerals, trace elements, and vitamins humans are commonly short of. Some minerals (like iron and zinc) are needed by plants in small quantities, but humans may need higher doses. Others (like selenium and iodine) are not needed by plants but are essential for human health.

Selenium is needed for DNA to reproduce accurately, while iodine is essential for brain function. Over years of continuous farming, these trace elements can become denuded from soils.

Bio-essential trace elements are critical to life. These include iron, cobalt, selenium, copper, zinc, molybdenum, vanadium, and cadmium. These elements are linked into the chemical structure of cells and become natural nutrients for survival. Cobalt is a central atom in the structure of vitamin B12. Zinc is essential for growth. Magnesium guards against heart disease, type 2 diabetes, and prostate cancer.

Summary Table: Plant Needs and Human Deficits

Conclusion

The Ying Yang Food idea is built on a practical observation: you can eat plenty of calories and still be nutritionally short-changed. When diets are low in minerals, trace elements, vitamins, omega-3, and phytochemicals, the body can drive cravings that lead to more overeating without real nourishment.

The solution is not to reduce food to a handful of pills, but to restore food to what it evolved to be: fresh plants grown in mineral-rich soils with active soil biology. The Ying Yang Food system combines the growing method (mineral-enriched soil, wicking bed moisture stability, biological conversion of minerals, recycling food waste) with an ethical distribution method that links grower and customer, uses coaches, and provides independent soil testing and certification.

In short: this is a system designed to grow and deliver living food—fresh, verified, and biologically complete—so people can eat in a way that supports long-term health.

This month’s newsletter focuses on wicking baskets, also called the Ying Yang system. While the concept is simple, understanding why and how it works takes much longer. After spending several months in China investigating the rise of diabetes and exploring health-giving plants, I have developed ideas I am eager to share. This system is designed to promote both health and fertility, inspired by the traditional Chinese approach to well-being. It blends ancient knowledge with modern technology, aiming to address some of the most pressing dietary challenges of our time.

The Great Health Epidemic

When most people think of an epidemic, they imagine contagious viruses or bacterial outbreaks. However, the epidemic we face today is far more subtle and pervasive: it is driven by diet. Modern eating habits, characterized by high sugar, fat, and salt content, have led to a silent but devastating health crisis. Obesity rates are soaring worldwide, but even more concerning is the hidden accumulation of visceral fat around organs such as the liver, pancreas, and heart. Unlike external fat, which is visible, this internal fat disrupts metabolism and increases the risk of diabetes, cardiovascular disease, and chronic inflammation.

The issue is not merely overeating. It is linked to the complex interplay of hormones, gut bacteria, and nutrient deficiencies. Our stomachs release hormones and neurotransmitters such as leptin and ghrelin, which signal hunger and satiety to the brain. When these signals are disrupted—through processed foods, antibiotics, or poor diet—our bodies can experience persistent hunger even when energy needs are met. This leads to overconsumption, weight gain, and the “hungry beast” that drives chronic disease.

Modern Diets and Nutritional Deficiencies

Humans evolved to require large quantities of green vegetables and fruits, which provide essential vitamins, minerals, and phytochemicals. Nutrients such as zinc, iron, calcium, selenium, Omega-3 fatty acids, and vitamins B1, B2, D, and E are critical for cellular repair, hormonal balance, and energy production. Unfortunately, modern diets are heavily skewed toward sugar, salt, and processed fats, creating a disconnect between caloric intake and nutrient fulfillment.

Processed foods are engineered to stimulate cravings rather than satisfy hunger. This is particularly true for ultra-processed snacks, soft drinks, and convenience meals. When the body is deficient in key micronutrients, it continues to signal hunger, prompting further consumption of empty calories. This cycle contributes not only to weight gain but also to metabolic syndrome, a cluster of conditions including insulin resistance, high blood pressure, and abnormal cholesterol levels.

The Ying Yang Approach

The Ying Yang Organisation (YYO) was created to address these dietary shortcomings. At its core, the system connects consumers directly with growers committed to producing nutrient-rich plants. The produce is grown in transportable wicking baskets within a “mother wicking bed” and delivered to the customer’s “daughter wicking bed,” where it continues to grow until harvested. This innovative approach preserves freshness, maximizes nutrient retention, and ensures that plants reach the consumer in optimal condition.

Consumers can pre-order specialty plants, including heritage varieties and ancestral crops, which are naturally higher in essential minerals and phytochemicals. This direct-to-consumer model allows growers to focus on nutrition rather than mass production, ensuring transparency and consistency. Independent soil testing further certifies the nutritional value of the produce, creating a trustworthy system for health-conscious buyers.

Benefits of the Ying Yang System

Freshness and Nutrient Retention

Conventional food distribution involves harvesting, refrigeration, and transport, which degrade freshness and reduce nutrient content. In contrast, the Ying Yang system allows plants to continue growing during delivery, ensuring that consumers receive food at its peak of freshness and nutritional density. Studies show that nutrient levels, particularly vitamin C and antioxidants, diminish rapidly after harvest; keeping plants alive during transit preserves these essential compounds.

Improved Logistics

By connecting growers directly to consumers or central depots, the Ying Yang system simplifies distribution, reduces handling stages, lowers costs, and minimizes food waste. Organic and nutrient-rich produce is particularly prone to spoilage, making conventional supply chains inefficient. Living wicking baskets maintain freshness, reduce loss, and make sustainable, high-quality food accessible year-round.

Health Benefits

The Ying Yang system is designed to combat metabolic syndrome and related conditions by providing plants rich in essential nutrients that support hormonal balance and gut health. A diet rich in green vegetables, herbs, and ancestral plants can regulate hunger signals, reduce visceral fat, and improve energy metabolism. Herbs such as sage, rosemary, and basil add flavor while supplying trace minerals and antioxidants, making healthy eating both effective and enjoyable.

Education and Consumer Awareness

The YYO website will serve as more than a marketplace. It will educate consumers about nutrition, metabolic syndrome, and the role of gut bacteria in health. Resources will explain how modern diets disrupt leptin and insulin signaling, contributing to chronic hunger and overeating. Guides on herbs, ancestral plants, and nutrient-dense vegetables will empower consumers to make informed choices and integrate health-promoting foods into their daily routines.

Growers and Certification

YYO partners with growers committed to sustainable, nutrient-focused agriculture. Farmers are trained in micronutrient application, soil biology, and minimal chemical use. Soil is regularly tested to verify nutrient content, and produce is certified for nutritional quality. This ensures that every plant delivered through the Ying Yang system meets strict standards for health and sustainability.

Why Online Trading Works

Online retail allows consumers to bypass traditional supermarket supply chains, which often prioritize cost over nutrition. YYO facilitates direct contracts between consumers and growers, with the organisation earning royalties while maintaining ethical and quality standards. Although prices may be slightly higher, the superior nutrition, freshness, and traceability justify the investment. Consumers receive produce guaranteed to support health, while growers are incentivized to produce nutrient-dense crops rather than high-yield but low-nutrient varieties.

Historical Context of Food

Humans evolved over millions of years consuming fruits, vegetables, and protein-rich foods. Early primates relied on foraging, developing social and cognitive skills to survive. As humans became hunter-gatherers, they incorporated meat and cooked foods, increasing caloric intake and brain development. Fat storage became a survival mechanism, allowing humans to endure periods of scarcity. However, modern diets, abundant in refined sugars and processed fats, exploit these evolutionary drives, leading to overeating and metabolic disorders.

Agriculture and Modern Challenges

The development of agriculture provided reliable food supplies but reduced dietary diversity. While industrialization and improved medicine decreased mortality rates, intensive farming depleted soil nutrients and shifted focus toward high yields over nutrition. Modern agriculture often produces calorie-dense but nutrient-poor food, exacerbating the hidden fat and metabolic syndrome problem. The Ying Yang system addresses this by growing plants in nutrient-rich soils and delivering them alive to consumers, preserving both flavor and nutritional value.

Problems with Modern Diets

Excessive sugar consumption, particularly fructose, disrupts hunger regulation and fat metabolism. Processed foods exploit this by creating addictive flavors that drive overeating. Meanwhile, diets lacking essential vitamins, minerals, and phytochemicals leave the body craving nutrients it cannot access. The “hungry beast” persists, fueling chronic health problems, fatigue, and obesity. Incorporating fresh, nutrient-dense plants and herbs, as the Ying Yang system promotes, can recalibrate hunger signals and restore metabolic balance.

Limitations of Existing Solutions

Permaculture, organic farming, and home gardening offer partial solutions but face limitations. Organic certification often does not measure nutrient content, and home gardens are restricted by space, seasonal variability, and growing expertise. Farmers markets provide fresh produce, but availability is inconsistent and nutrient density cannot always be guaranteed. The Ying Yang system solves these challenges by providing year-round, certified, nutrient-rich plants directly to consumers.

The Ying Yang Solution

By combining ancestral plant varieties, certified nutrient-rich soils, and living wicking baskets, the Ying Yang system addresses modern dietary challenges at multiple levels. Growers focus on quality over quantity, consumers receive nutritionally optimized produce, and the direct-to-consumer supply chain maintains freshness and reduces waste. Herbs and vegetables enhance both taste and health, making sustainable and nutrient-dense diets enjoyable and practical.

Conclusion

Modern health crises like diabetes, cardiovascular disease, and obesity are largely driven by diet. Nutrient deficiencies, disrupted hormonal signaling, and overconsumption of processed foods have created a silent epidemic. The Ying Yang system offers a practical, ethical, and scalable solution. By delivering living, nutrient-rich plants in wicking baskets and connecting growers directly with consumers, YYO provides fresh, flavorful, and health-promoting produce. This approach not only combats the “hungry beast” but also fosters sustainable farming, supports ancestral plant varieties, and promotes long-term health. Through education, certification, and innovative logistics, the Ying Yang system is poised to revolutionize the way we eat and think about food, creating a healthier future for everyone.

This article explores the practical and biological principles behind wicking worm beds—a sustainable and water-efficient growing system. By creating an underground water reservoir and fostering a healthy soil ecosystem with worms and microorganisms, these beds deliver water and nutrients directly to plant roots. They maximise productivity, reduce water loss, recycle organic waste, and are suitable for a wide range of scales—from backyard gardens to large orchards—supporting resilient and sustainable food production.

Introduction

Water shortages are increasingly affecting food production worldwide. Wicking worm beds are an innovative solution that conserve water, improve soil health, and recycle organic material into nutrients for plants. The system uses an underground pond or reservoir contained by a waterproof liner, supplying water from the base directly to plant roots. Unlike traditional irrigation, which washes nutrients downwards and may create stagnant, anaerobic water at the base, wicking beds move water continuously upwards through capillary action, delivering nutrients efficiently and keeping roots oxygenated.

Basic Principles

The underground reservoir stores water, and water is drawn upward to plant roots by wicking action. Applying water from above can cause nutrient leaching and accumulation of stagnant, nutrient-rich water that becomes anaerobic and toxic. Wicking beds prevent this by delivering water to the base of the reservoir, ensuring continuous upward flow. This “first in, first out” movement keeps the water fresh, maintains oxygen levels, and prevents harmful gasses from accumulating.

Proper water, air, and nutrient balance is crucial. Too much water can suffocate roots, while too little restricts growth. Roots also release gasses such as carbon dioxide and ethylene, which influence plant growth. Wicking beds maintain this balance, providing a reliable water supply while supporting healthy microbial activity, ensuring high productivity even in dry conditions.

Improving Performance

Increasing Wicking Action

The upward movement of water can be enhanced by adding organic material to the soil above the reservoir. Fibrous materials like bagasse, straw, or mulch are particularly effective. These materials help retain water, improve distribution, and support microbial life. Over time, they decompose slowly, releasing nutrients while retaining structural integrity, improving both water movement and fertility in the soil.

Allowing Roots to Breathe

Because water is applied from below, the soil surface remains dry, allowing air to infiltrate. Filling the reservoir expels stale air, and as water is used, fresh air is drawn in. This cyclic breathing effect, similar to flood-and-drain irrigation, enhances oxygen availability for roots and microbes. Roots need oxygen to function properly; without it, growth is limited, and plants may experience stress or nutrient deficiencies.

Maintaining Soil and Biological Activity

Soil condition is vital for efficient wicking. Heavy clay or compacted soils hinder water movement and root penetration. Initially, organic matter such as bagasse or compost improves porosity and water distribution. Over time, worms help condition the soil by feeding on microbial by-products rather than raw organic material, producing nutrient-rich castings. These castings enhance soil structure, microbial activity, and plant growth, creating a self-sustaining fertile medium.

Introducing and Feeding Worms

Worms are essential for nutrient cycling. Use inoculator kits containing worms, castings, microbes, and minerals to introduce them. Worms can be spread on the surface or released from a container to migrate naturally. Continuous feeding with organic material, such as kitchen scraps or fibrous mulch, sustains worm populations. Worms are at the end of a biological chain—they transform microbial output into plant-available nutrients, enriching the soil effectively.

Water Storage and Irrigation Management

Wicking beds store more water than traditional soil. Internal reservoirs reduce the frequency of irrigation, while external storage containers can extend capacity and manage overflow. Float valves and automated systems can maintain water at optimal levels, though pulsed filling cycles are beneficial for aeration. Adjusting the water level during seed germination or early growth supports fine root development, while later lowering the level prevents root rot and encourages proper tuber or fruit formation.

Versions and Applications

Wicking worm beds can be adapted for various scales and uses:

• Simple Box Systems: Plastic or timber boxes with water pipes and slotted drainage distribute water evenly. Larger pipes improve monitoring and increase capacity.
• Raised On-Ground Beds: Earth or timber walls lined with polyethylene form a reservoir. Slotted drainage spreads water, and terracing ensures level planting areas.
• In-Ground Beds: Dug into soil, lined with waterproof material. Sieved compost or amended heavy soil forms the base. Mulch on top maintains humidity and aids germination.
• Strip Irrigation Beds: Narrow beds alongside plant rows wick water sideways. Ideal for trees or deep-rooted perennials, converting existing orchards, and enabling cascading terraces for sloped land.
• Tiered Beds and Pots: Individual containers filled with organics allow localized irrigation. Cascading systems can use greywater, purifying it across successive beds for safe vegetable growth.

Root Systems and Plant Growth

Fine feeder roots near the surface extract nutrients effectively but are sensitive to over- or under-watering. Coarser roots in the reservoir are resilient but less efficient. By carefully managing water levels, wicking beds maintain healthy fine roots while deeper roots support plants during stress. Maintaining microbiological activity ensures nutrient availability, with worms and microbes transforming organics into plant-usable forms. Proper feeding, composting, and water cycling sustain growth, even under drought conditions.

Greywater Integration

Cascading wicking worm beds allow reuse of greywater. Initial beds can irrigate ornamental or fruit trees, with later beds using progressively cleaner water for sensitive crops like vegetables. This maximizes water efficiency, recycles household organic waste, and supports sustainable gardening practices.

Common Mistakes and Best Practices

Frequent errors include overfilling reservoirs, compacting soil, using heavy clay without amendment, or neglecting worm feeding. Avoid flooding the upper soil layers where fine roots grow, and maintain a moderate reservoir depth (usually 300 mm). Include drainage, monitor water levels, and maintain soil biology through compost and mulch. With careful management, beds can last for years, providing high yields with minimal water.

Benefits of Wicking Worm Beds

Wicking worm beds conserve water, reduce evaporation and seepage losses, recycle organic waste, and support soil fertility. They produce higher yields than conventional systems with less water, improve soil structure, and allow reliable food production in challenging climates. From school gardens to commercial orchards, they offer simple, efficient, and sustainable solutions for growing vegetables, fruits, and other crops while supporting environmental stewardship.

Conclusion

Wicking worm beds combine simple engineering with natural biology to provide sustainable, water-efficient gardening. They deliver water and nutrients directly to roots, foster healthy soil life, and support productive plant growth. Adaptable from home gardens to large-scale orchards, these systems reduce water usage, enhance soil fertility, and create resilient, low-maintenance food production systems. Careful management ensures long-term productivity and sustainability.

Colin Austin — © Creative Commons. Reproduction permitted with source acknowledgement; commercial use requires a license.

This practical guide walks you through building a wicking bed from groundworks to planting. It explains site choice, excavation, liners, reservoir construction, compost/feeder pipes, soil mixes, and establishing soil biology with compost and worms. Emphasis is on simple, low-cost materials, good drainage, and creating a moist root zone that reduces watering and builds fertility. Clear steps and maintenance tips make it suitable for home gardeners, schools and community projects.

Introduction

Constructing a wicking bed is straightforward when you understand the basic parts and how they work together. A wicking bed stores water below the root zone and lets it move upwards by capillary action so plants access moisture when they need it. A successful build balances a water reservoir, a porous wicking zone, a fertile topsoil and active soil biology (worms, fungi and microbes). The result is a low-maintenance, water-efficient garden bed that supports strong plant growth.

1. Choose the Site and Type

First choose where the bed will sit. Sunny, level ground with good access is ideal. Decide whether you want an open bed (in contact with surrounding soil) or a closed container bed (lined box or tank). Open beds are cheaper and encourage natural microbial migration from surrounding soil; closed beds retain all water and are useful where native soil is poor or contaminated. Consider proximity to water supply, ease of refilling and access for maintenance.

2. Marking and Excavation

Mark the bed outline and remove topsoil to the required depth. Typical dimensions for a proficient garden bed are a reservoir depth of about 300 mm and a growing zone of 200–300 mm. For larger or tree planting beds adjust depths accordingly but keep the wicking height effective — very deep reservoirs can leave the topsoil too dry. Excavate to the depth needed for your reservoir and ensure a level base so water distributes evenly.

3. Liners and Waterproofing

Line the reservoir with a durable, food-safe liner — heavy-duty polythene is common. Make sure the liner is free of sharp objects and is well sealed at the edges so water cannot leak into surrounding soil unless you want an open bed. Where roots may puncture or where stones exist, add a protective mat or old carpet beneath the liner. The liner should also be anchored or tucked at the bed edges so it won’t shift as you fill the bed.

4. Reservoir Fill Materials

Fill the reservoir with coarse organic material rather than only grit or stones. Bulky organic material (wood chips, coarse compost, prunings) stores a lot of water, creates voids that act like a sponge and feeds microbes as it slowly decomposes. Avoid the trap of assuming stones are best: organic matter also produces a nutrient-rich “compost tea” that wicks upward and feeds roots. Pack the reservoir but leave pathways for water movement and avoid compacting it solidly.

5. Install Inlet, Overflow and Drainage

Install a fill/inlet pipe that reaches the reservoir so you can top up water without disturbing the planting surface. Fit an overflow pipe set at the desired maximum water level so excess water drains away safely during heavy rain. Where the bed is closed, provide an inspection or drain access to remove sediment or flush the reservoir if needed. For open beds consider how water might escape into adjacent ground and plan planting or buffer strips accordingly.

6. Compost Tube / Feeder Pipe

A central compost or feeder tube is highly useful. This is a vertical pipe or sleeve that reaches from the soil surface down into the reservoir. Fill it with compost, green matter or nutrient amendments; these materials leach nutrients into the reservoir and wick into the root zone. The tube makes it easy to refresh organic matter over time and promotes concentrated nutrient delivery to establish plants quickly.

7. Soil Mix and Layering

Above the reservoir, build a well-structured soil zone. The topsoil layer should be a blend of loam, compost and some coarse material for structure — roughly a 60:30:10 ratio (topsoil:compost:coarse material) is a good starting point but adjust to local materials. The soil must hold moisture by capillarity yet remain open enough for air. Heavy clay will compact and reduce oxygen; very sandy mixes will not hold water well. Mix thoroughly and avoid sharp layering that blocks capillary flow.

8. Establish Soil Biology

Introduce life — compost, worm castings and a small starter population of compost worms will accelerate biological development. Mycorrhizal inoculants can help young plants access nutrients more efficiently, especially in poor soils. Avoid sterilising the bed: the goal is to encourage a diverse microbial community that cycles nutrients, produces structure and supports plant health. Keep refuge areas and avoid overuse of fungicides or harsh chemicals that will upset the balance.

9. Planting Strategy

When planting, place seedlings or transplants so roots can reach the moist zone quickly. For direct sowing, lightly water the surface to encourage germination, but once roots are established rely on the reservoir fill system to supply moisture. Group plants by water needs: heavy feeders nearer the compost tube or inlet, lower-water crops toward edges where wicking may be weaker. For trees or deep-rooted plants design wider or ringed wicking zones to ensure deep root access.

10. Initial Filling and Commissioning

Fill the reservoir slowly and allow the bed to stabilise. Observe how water rises into the soil and check for uneven wetting or dry spots. If necessary, top up slowly to ensure full capillary contact between reservoir and soil. Let the bed sit for a few days, then check for any leaks, settling or blocked overflows before planting widely.

Maintenance and Topping Up

Maintenance is minimal but important. Refill the reservoir as needed through the inlet pipe — frequency depends on climate and plants. Top up the compost tube periodically with green matter or compost to sustain nutrient supply. Each season add a layer of compost or mulch to the surface to feed microbes and conserve moisture. If beds settle over time add soil to maintain planting depth and keep the reservoir at the designed level.

Troubleshooting

Common problems include: poor wicking because of an impermeable seam or compaction; foul odours indicating anaerobic conditions (often due to overfilling the reservoir or very fine, impermeable base fill); and uneven wetting caused by an unlevel base. Remedy these by loosening compacted zones, adjusting reservoir depth, improving drainage or replacing part of the fill. For persistent odour or stagnation, empty and dry the reservoir for a short period, refresh organic content and reintroduce aeration via worms and coarse material.

Scaling and Variations

Wicking technology scales well. Small balcony boxes use the same principles as community beds and orchard rings. For larger systems, think in modular rows or blocks, and incorporate water capture (swales, small dams) to feed reservoirs. Raised tree rings with dedicated wicking reservoirs or narrow in-row reservoirs beside trees can extend the method to orchards and larger plantings.

Benefits Recap

Well-built wicking beds reduce water use, feed plants with nutrient-rich leachate, reduce labour for irrigation, and help build long-term soil health. They are forgiving systems that reward slow, steady organic management rather than quick fixes. By creating a moist, biologically active root zone you can grow productive, resilient plants with far less water and lower input costs.

Download ‘Wicking Beds Under Construction: Beginner’s Guide to Reservoir Gardening’ (full PDF)

This article draws on practical instructions for building efficient wicking beds — whether open-in-ground or closed container types. It outlines how to design, construct and maintain these beds to ensure steady moisture, support soil biology, and reduce water waste. With the right liner, soil mix, drainage and reservoir setup, gardens can thrive even in dry climates while needing minimal ongoing effort.

Introduction

Wicking beds are an effective, low-tech gardening solution for those who want to grow plants with minimal watering, conserve soil moisture, and support soil health. This guide summarises key steps and considerations when building a wicking bed — whether you choose an open bed set in the ground, or a closed container style. Understanding the principles behind water wicking, drainage, and soil biology helps make a reliable system suited to your space and climate.

Choosing the Right Type: Open vs Closed Wicking Beds

Before building, decide whether you want an open bed (in or on the ground) or a closed bed (in a box or container). Open wicking beds are usually suited to larger gardens — they can run 10–20 m or more, are cheaper to set up and allow the soil to connect with the surrounding ground. This connection helps soil biology develop naturally. However, because water can wick out into adjacent soil, you must carefully schedule watering — over-watering may waste water, though you can also take advantage of that water by planting thirsty trees nearby.

Closed beds are built in containers such as wooden boxes, metal bins or raised planters. They are usually smaller (up to a few metres), and soil and reservoir are isolated from the surrounding ground. This means you must build soil biology from scratch (add compost, worms, microbial inoculants, etc.), but you’ll retain all the water, and maintenance becomes simpler — simply refill the water reservoir when it drops low.

How to Build an Open Wicking Bed

For an open bed, first remove roughly 300 mm of topsoil and check the ground is level. Once level, line the bottom with a waterproof liner and install water inlet and outlet pipes. Fill the reservoir zone with organic waste — wood chips, sugar-cane mulch or similar — rather than inert material. Then replace the topsoil, raising the bed so that the top sits roughly 300 mm above ground level. This raised bed design both improves drainage and makes it structurally sound.

At this stage you have options: you can allow the soil in the bed to connect directly to the surrounding soil, encouraging microbial migration and natural soil biology, or you can build a barrier (for instance using logs or shade-cloth fencing) around the bed to keep it isolated — effectively turning it into a closed bed if you prefer more control.

It’s wise to situate the bed along a contour line if possible, and provide drainage at each end so that heavy rainfall does not cause flooding. With thoughtful construction, this type of open wicking bed can be very large and serve multiple crops or even fruit trees.

How to Build a Closed Wicking Bed (Container Style)

For a closed bed, choose a waterproof container (timber box, water-tank, raised bed or even a large bin). Inside, you’ll build the water reservoir at the bottom, then a soil zone above separated by a permeable barrier. Drainage of the soil layer is critical — otherwise water may accumulate and cause root rot.

One recommended approach is to drill several fairly large holes (10 mm or more) around the base or sides of the container. Line the holes with shade-cloth (or similar) to prevent soil from washing out. Alternatively, line the box with shade-cloth before filling; inside this liner, soil is held, while water drains freely outside it.

A successful closed bed requires a well-sealed liner, reliable plumbing, and a well-aerated soil mix. Once built, it behaves like a self-contained, efficient water reservoir — ideal for balconies, patios, urban gardens or places with non-ideal soil.

Why Organic Material Wins over Sand or Stones

While some builders assume sand or stone at the bottom will last longer than organic waste, there are drawbacks. Sands or inert materials may indeed store water, but they offer no nutrients; over time they can silt up or compact, reducing effectiveness. Organic material immersed in the reservoir, however, doesn’t decompose as in a traditional compost heap — it forms a “compost tea,” rich in nutrients, that wicks upwards with the water and feeds plant roots. This natural fertilizing effect gives wicking beds an advantage that simple stone reservoirs cannot match.

Wood chips and bulky organics, however, can reduce available nitrogen — so it is advisable to supplement with nitrogen-rich amendments (e.g. blood-and-bone or similar organic fertilizers) to maintain soil fertility. Plants such as legumes or nitrogen-fixing natives are also useful for restoring balance.

Planting and Maintenance Guidelines

When planting, make sure the soil surface is dry. For seeds or seedlings, it’s okay to wet the surface initially. Once roots establish into the moisture zone, watering should be done via the inlet pipe only. Never water from the top after that — otherwise you may saturate the soil, reducing oxygen and harming root growth.

Harvesting gives an opportunity for maintenance: dig your crops carefully down to just above the liner, remove produce, then refill that hole with fresh organic material. Over time, by repeating this process in different spots, you gradually renew organic content in the bed, helping maintain soil fertility and structure.

Bed Depths and Soil-to-Water Ratios

Proper depth for a wicking bed is important. The reservoir (water + organic/wicking zone) should generally be around 300 mm. If it’s deeper than the soil’s maximum wicking height, water won’t reach the soil layer effectively, and the bottom may turn into a stagnant, anaerobic mess. If you make the reservoir shallower, the bed will work — but you’ll need to refill more often.

The topsoil or growing zone should roughly be 200–300 mm deep for most vegetables. This offers ample room for root growth without making the upper soil too dry. For deeper-rooted plants or trees, beds can be deeper — but careful planning is needed to ensure water wicks effectively to feed roots. If using tall containers, add a base fill under the liner so the actual soil/water depth stays in range.

Watering, Drainage, and Irrigation Scheduling

Closed beds have the advantage of holding water in the reservoir until plants draw it up — there’s little to no loss to surrounding soil, and you only need to refill when water levels drop significantly. Open beds, on the other hand, can lose water sideways into adjacent soil, meaning you must monitor both the bed and surroundings to avoid over-watering.

A good practice is to avoid watering too frequently. After filling the reservoir once, allow the soil to draw down the water until the level drops below a safe line — only then top up. Over-watering leads to saturated soil layers with poor oxygenation, which can harm roots and microbes. Excessive moisture over long periods can lead to root rot, fungal problems, and a “stinking” bed.

Why Soil Mix and Organic Matter Matter

Wicking beds depend on a free-draining, porous soil mix — ideally a loamy soil enriched with compost or well-rotted organic matter. Heavy clay soils are not suitable because they hold too much water or compact, restricting airflow and root growth. The goal is a balance: soil must wick water up from the reservoir, but also drain sufficiently so roots get enough oxygen.

Keep the soil’s biology alive by regularly adding compost or organic amendments, especially after harvesting. Healthy microbial life, aided by worms and fungi, improves soil structure, releases nutrients, and buffers plants against stress. This natural fertility reduces — or even eliminates — the need for chemical fertilizers over time.

Advantages of Wicking Beds Over Traditional Irrigation

Wicking beds offer many benefits: they provide consistent moisture directly to roots, minimize water loss from evaporation or deep drainage, and create biologically active soil. Especially in arid or unpredictable climates, they permit reliable vegetable or food production with reduced effort and water use. They reuse organic waste, capture rainfall or greywater, and support long-term soil fertility. For small gardens, school plots, community gardens, or backyard veggie patches, they are ideal.

Common Mistakes and How to Avoid Them

Some common pitfalls include using sand or inert layers that eventually block wicking, failing to seal the liner properly (leading to leaks or loss of water), building reservoir layers too deep for capillary action, or using heavy clay soils that won’t wick efficiently. Others include over-watering (especially in open beds), neglecting drainage, or failing to add organic matter — which leads to poor soil biology and diminished productivity.

To avoid these issues: seal liners carefully, use a porous soil mix with organic matter, keep reservoir depth moderate (around 300 mm), include good drainage for soil layer, monitor water levels responsibly, refill only when needed, and maintain soil life with compost and mulch. With careful attention, wicking beds can last for many seasons and deliver high yields with minimal water.

Conclusion

Wicking beds represent an elegant blend of simple engineering and natural soil biology. Whether you choose an open bed or a closed container, when built properly — with a water-tight liner, correct reservoir and soil depths, porous soil rich in organic matter — these systems can offer reliable, water-efficient gardening. By delivering moisture directly to roots, reducing waste, and nurturing living soil, wicking beds provide a sustainable, robust method for growing food even in challenging climate conditions.

This article explores the development and functioning of wicking beds, comparing the use of stones and organic materials. Colin Austin explains the evolution from simple water storage systems to sophisticated microbiological beds, highlighting nutrient cycling, soil health, and climate resilience. Wicking beds combine low-tech engineering with natural processes to enhance plant growth, improve water efficiency, and support sustainable gardening in challenging environments.

Introduction

Wicking beds have evolved significantly since their inception. Originally designed as simple water storage systems for communities with erratic rainfall, they now incorporate biological systems to improve nutrient availability, soil structure, and plant health. This article examines the phases of wicking bed development, contrasts the use of stones versus organic materials, and explores the benefits of integrating microbiology and climate-conscious gardening practices.

Phase 1: Wicking Beds for Water Storage

The concept of wicking beds emerged in Ethiopia to provide subsistence food during dry periods. The goal was to create a cheap, effective water storage system accessible to people with minimal resources. Early designs involved digging a hole, placing a water container, and covering it with soil. Various containers, such as old tires, bathtubs, drums, or plastic liners, were used to store water.

Wicking relies on soil’s natural ability to hold water by surface tension. When soil exceeds its field capacity, excess water drains away. The soil’s field capacity represents the amount of water retained without drainage, while the wilting point indicates the moisture level below which plants cannot extract water. A water reservoir increases available water, often doubling or tripling it compared to conventional soil, making plants more resilient to dry spells.

Phase 2: Wicking Beds as Biological Systems

While early designs focused on water storage, it became clear that soil fertility was also crucial. Organic materials such as weeds were added to beds to create compost tea that wicks nutrients to plant roots. Weeds provide both effective wicking and increased storage volume. Deliberately grown nutrient-rich plants, including Australian native species like Acacias, can also be pruned and added to wicking beds to supply essential nutrients such as phosphorous.

Beneficial microorganisms further enhance wicking beds. Worms naturally aerate soil and distribute organic material, while mycorrhizal fungi form symbiotic relationships with plants. These fungi extend fine hyphae into the soil, extracting water more efficiently than roots alone and breaking down nutrients locked in soil particles. Mycorrhizal fungi are vital for plant growth, particularly in nutrient-poor soils, and are easily damaged by excessive tillage, highlighting the need for biological soil management.

Phase 3: Wicking Beds and Climate Change

As awareness of climate change grew, it became clear that wicking beds could play a role in adaptation. Australian weather is characterized by extreme droughts and floods, and wicking beds help stabilize water availability for plants. Additionally, plants can absorb significant amounts of carbon, reducing atmospheric CO₂ levels. Wicking beds maximize plant growth and carbon sequestration, contributing to climate mitigation while ensuring resilient food production.

Stones versus Organics

Many gardeners debate whether to use stones or organic materials in wicking beds. Stones have been traditionally used to create a lower drainage layer, often covered with geotextile fabric. However, soil eventually fills the spaces between stones, forming a solid “concrete-like” layer, which limits storage capacity and increases excavation energy. Organic materials, such as compost, weeds, or pruned plant matter, provide both water storage and nutrients. They also support soil microbiology, which enhances water and nutrient uptake.

Organic material layers at the base of wicking beds decompose slowly, while worms transport surface organic matter deeper into the soil, naturally maintaining bed structure. This combination of organic matter, worms, and fungi creates a dynamic ecosystem, allowing plants to thrive with minimal external inputs. The microbial activity not only improves plant growth but also contributes to long-term soil health and sustainability.

Water Efficiency and Nutrient Cycling

Wicking beds enhance water efficiency by maintaining a consistently moist root zone. Water is drawn upwards through capillary action, reducing evaporation and ensuring that plants have access to moisture during dry periods. Organic materials improve water retention compared to stone layers, and compost tea provides a slow-release nutrient source. Nutrient cycling is supported by worms and fungi, which decompose organic matter and make nutrients available to plants.

Incorporating a variety of organic inputs and carefully managing bed structure reduces the need for chemical fertilizers. Nutrient mining from non-food plants grown in beds or using waste water further supplements soil fertility while maintaining safety. This approach integrates low-tech solutions with biological processes to improve productivity in both home gardens and larger agricultural systems.

Practical Guidelines for Gardeners

• Use decomposed organic material as the primary base layer instead of stones for better water retention and nutrient supply.
• Introduce worms and mycorrhizal fungi to enhance soil structure and plant growth.
• Top up beds with fresh organic material regularly to maintain active microbial activity.
• Monitor water levels carefully to balance saturation and aeration.

Consider local climate conditions when designing beds. In hot, dry environments, deeper beds with more organic material provide a buffer against drought. In cooler or wetter regions, manage surface water to prevent waterlogging. Combining wicking beds with mulching, shading, or rainwater capture can further improve efficiency and plant resilience. These methods collectively create a low-maintenance, productive garden system.

Long-term Benefits

Wicking beds with organic bases improve plant growth, increase water availability, and support soil health. They also contribute to carbon sequestration, making them environmentally valuable. By integrating biological principles, gardeners can create sustainable, resilient food production systems capable of withstanding climate variability. Over time, beds require less external input, reducing costs and supporting long-term ecological sustainability.

Conclusion

Colin Austin’s exploration of stones versus organics highlights the evolution of wicking beds from simple water storage devices to sophisticated biological systems. Prioritizing organic materials, supporting worms and fungi, and managing nutrient cycling allows gardeners to maximize water and nutrient use efficiently. Wicking beds provide a practical, environmentally conscious solution for sustainable gardening, contributing to food security, soil regeneration, and climate adaptation.

Download ‘Stones vs Organic Materials: Optimising Wicking Bed Performance’ (full PDF)

This article explores the latest developments in wicking bed technology, highlighting design innovations, soil improvements, and water management strategies. Modern wicking beds combine sustainable materials, efficient water use, and healthy soil biology to create resilient, productive gardens. From urban balconies to community gardens, these systems allow gardeners to grow food with less water while regenerating soil, reducing maintenance, and improving plant health in challenging climates.

Introduction

Wicking beds are one of the most effective ways to garden sustainably, particularly in areas facing water scarcity or unpredictable weather. They store water at the base of the bed and allow it to rise gradually through the soil, giving plants constant access to moisture. This prevents drought stress, reduces water waste, and supports healthy plant growth. Over the past decade, innovations in wicking bed technology have made them easier to build, more durable, and better suited to a variety of environments.

Beyond water efficiency, wicking beds encourage living soils. Healthy soil ecosystems improve nutrient cycling, support beneficial microbes and fungi, and strengthen plant resilience against pests and disease. Combining thoughtful design with soil biology allows gardeners to maximize production while reducing chemical inputs.

Design Improvements

Modern wicking beds incorporate layered media systems that optimize water distribution. Gravel, sand, and organic matter create a reservoir that ensures water wicks evenly into the root zone. Newer designs include enhanced overflow and drainage systems, which prevent waterlogging, salt buildup, and other issues common in early systems. This improves plant health and reduces maintenance over time.

Modular designs allow beds to be expanded or adapted to changing garden spaces. Stackable units, removable inserts, and adjustable overflow systems make these beds flexible for both small-scale home gardens and larger community projects. Some wicking beds now integrate simple sensors or automated irrigation controls to maintain optimal moisture levels, further improving reliability and reducing water waste.

Materials and Soil Enhancements

Material selection significantly affects a wicking bed’s durability and performance. Recycled timber, polyethylene tanks, and geotextile liners are now commonly used. These materials reduce costs, last longer, and are easier to maintain than traditional options. Soil mixes are enriched with compost, biochar, and other organic amendments to increase water retention, fertility, and microbial activity.

Absorbent mats or wicking fabrics are often added between the water reservoir and soil layer. These help distribute moisture more evenly and prevent dry pockets. Mulching the surface not only reduces evaporation but also moderates soil temperature and suppresses weeds. These techniques combine to create a resilient system that promotes thriving plant growth with minimal intervention.

Supporting Soil and Plant Health

Healthy soil is central to the success of wicking beds. Microbial inoculants or “bio-packs” introduce beneficial bacteria and fungi that support nutrient cycling, disease resistance, and robust root systems. By creating a living soil environment, gardeners can reduce reliance on fertilizers and pesticides.

Layering the bed ensures that the water reservoir remains separate from the main root zone while still allowing capillary action to feed the plants. Mulching and organic matter help maintain consistent soil moisture and protect the microbial community. Over time, these systems regenerate soil, improve fertility, and support a diverse ecosystem both above and below the surface.

Water Management

Water efficiency is the core advantage of wicking beds. Advanced systems optimize water delivery, preventing overwatering and under-watering. Overflow and drainage mechanisms ensure the bed does not retain excess water, which can harm roots or reduce oxygen availability. By connecting wicking beds to rainwater collection systems or greywater inputs, gardeners can further conserve water and make their systems more sustainable.

Strategic bed depth and soil layering reduce surface evaporation, keeping water where plants need it most. Mulching and plant selection also contribute to water conservation by shading soil and slowing moisture loss. These strategies are particularly valuable in regions with hot, dry summers or irregular rainfall patterns.

Applications and Flexibility

Wicking beds are highly versatile. They can be used in small backyard gardens, rooftop gardens, urban balconies, and community food gardens. They are suitable for both domestic and educational projects, allowing schools, universities, and community organizations to create hands-on learning spaces for sustainable agriculture.

Wicking beds also support larger urban farming initiatives. In urban areas, these systems make efficient use of limited space while conserving water. In rural areas, they are valuable for rehabilitating degraded land, as controlled water delivery and nutrient-rich soil amendments restore productivity and soil health. The adaptability of wicking beds allows gardeners to use them in different climates and soil conditions, from arid deserts to temperate regions and tropical areas.

Technology and Automation

Advances in technology have begun to enhance wicking bed performance. Soil moisture sensors connected to irrigation controllers allow automatic watering based on plant needs, soil conditions, and weather forecasts. Some systems even incorporate remote monitoring and data logging, providing insight into water use, soil health, and plant growth. These innovations make it possible to maintain optimal conditions with minimal effort, even for large-scale or urban projects.

Automation and data collection can also help gardeners experiment with different plant varieties, soil amendments, or irrigation strategies, offering valuable insights for improving productivity and sustainability over time.

Challenges and Considerations

Despite their advantages, wicking beds require careful planning and maintenance. Balancing soil depth, water reservoir size, and plant type is essential to avoid waterlogging or drought stress. High-quality organic matter is critical to support soil biology while minimizing disease risk. Overflow and drainage systems should be regularly inspected to prevent blockages or malfunction.

Gardeners must also consider seasonal changes and plant-specific water needs. Different crops may require different bed depths, soil mixes, or irrigation schedules. Understanding these variables ensures consistent growth and avoids stress to plants. With proper setup, wicking beds can provide a low-maintenance, productive system that thrives year after year.

Future Directions

The future of wicking beds is bright, with ongoing research and innovation enhancing their functionality. Integration with renewable energy allows automated irrigation in off-grid locations. New soil amendment techniques accelerate soil regeneration and improve plant productivity. Precision horticulture using sensors and IoT devices offers the potential for highly efficient urban and commercial gardening applications.

As climate conditions become more unpredictable, wicking beds provide a resilient solution for sustainable food production. Their combination of water efficiency, soil health, and adaptability makes them an increasingly important tool for gardeners, educators, and urban farmers around the world.

Conclusion

Modern wicking beds combine traditional gardening principles with innovative designs, materials, and management practices. They conserve water, support living soils, and provide resilient, productive growing systems. By embracing these technologies, gardeners and urban farmers can create sustainable, low-maintenance gardens that produce healthy food while regenerating soil. With ongoing innovation, wicking beds will continue to be a vital solution for sustainable food production in changing climates.