The basics of permaculture: living soil, biodiversity, self-sufficiency

In this article 7

Permaculture suffers from two symmetrical misunderstandings. For some, it is a gardening technique — mounds, mulching, and a little disorder. For others, it is a vague philosophy that no one knows how to put into practice. In reality, it is a design method, formalized in Australia in the 1970s by Bill Mollison and David Holmgren, whose name is a contraction of permanent agriculture — and later, by extension, permanent culture.

Its central proposition can be summed up in one sentence: rather than fighting a site's constraints, design a system that uses them. A slope becomes a water-management feature, a south-facing wall becomes a microclimate, and green waste becomes fertility. This article sets out the foundations — the ethics, the design principles, and the three practical pillars in the garden.

The three founding ethics

They are deliberately brief, and everything else follows from them. They are not decorative moral principles: each one has a direct operational application.

Care for the Earth. Preserve and regenerate living systems, starting with the soil. In practice: no tilling, no bare soil, no input that destroys underground life.
Care for people. A system that exhausts the person maintaining it is not sustainable, whatever its ecological merits. In practice: zoning — place close at hand whatever requires daily attention, and farther away whatever can manage on its own.
Share fairly. Redistribute surpluses rather than accumulating them, and limit your consumption. In the garden, this means exchanging seeds and seedlings, seed swaps, and passing on know-how.

This third ethic also explains why the question of reproducible seeds is central to permaculture: a seed that can neither be replanted nor passed on closes the loop of sharing.

Pillar 1 — living soil

Permaculture reverses a deeply rooted habit: we do not feed the plants, we feed the soil, and the soil feeds the plants. This is not a poetic expression; it is a description of the actual mechanism. A plant does not absorb organic matter: it absorbs mineral elements that only microorganisms make available by breaking down that matter.

A stratification that must not be reversed

Healthy soil is organized into biologically distinct layers. In the top few centimetres live aerobic organisms—bacteria and fungi that need oxygen. Below them live anaerobic organisms, which die on contact with it. Turning the soil with a spade reverses these two layers and kills both populations at once.

The soil then takes several months to rebuild, during which it releases its organic matter reserves abruptly. This creates the illusion of a “boost” after ploughing—followed, the next year, by genuine depletion.

The mycorrhizal network

Mycorrhizal fungi form a network of filaments around and inside roots, considerably extending their absorptive surface. The plant supplies sugars produced through photosynthesis, while the fungus provides water and minerals gathered from well beyond the root zone. This network takes several years to build and only a few minutes with a rototiller to destroy.

The three practices that follow from this

Do not turn the soil. Aerate it with a broadfork, which loosens the soil without inverting the layers.
Never leave the soil bare. Exposed soil loses nitrogen with every rainfall, compacts under the impact of raindrops, and bakes in the sun. Keep it permanently mulched or covered with vegetation.
Apply organic matter to the surface, never burying it deeply: the organisms that process it live at the surface. Buried twenty centimetres deep, it ferments instead of decomposing.

The biological details are covered in The Basics of Living Soil, Composting, and The Different Types of Soil.

Pillar 2 — biodiversity as stability

A permaculture garden is not disordered through neglect. Diversity serves a precise function: stability. In ecology, a diverse system better cushions disturbances: a pest attack, a drought, or a late frost never destroys everything because the species do not all respond in the same way.

A monoculture, by contrast, puts everything on a single roll of the dice: whatever affects it affects the entire crop.

Diversifying at three scales

Between species — the obvious point: do not fill a bed with a single crop.
Between varieties of the same species — much less common in practice, yet decisive. Three tomato varieties respond differently to late blight in a given year. It is free insurance.
Over time — staggered blooms from March to October, so beneficial insects can find food throughout the season.

Feeding adult beneficial insects

This is the point most often missed. Ladybirds, hoverflies, and lacewings consume large quantities of aphids, but only in their larval stage. Adults feed on nectar and pollen. Without flowers nearby, they will not settle or lay eggs — so you will never have larvae.

The most effective families are the flat-topped umbellifers (dill, coriander, fennel, flowering carrots) and the Asteraceae (marigolds, cosmos, cornflowers). See our nectar-rich plants.

The wild zone is not a wasteland

Leaving an uncultivated patch is not neglect: it is the reservoir from which beneficial insects recolonize the garden after each disturbance. A pile of dead wood, a few nettles, and an untrimmed hedge provide shelter for hedgehogs, ground beetles, spiders, and parasitoid wasps. A few square metres are enough.

The details of how plants help one another are covered in The best vegetable combinations for the garden.

Pillar 3 — self-sufficiency as a direction

Self-sufficiency is not autarky, and it cannot simply be declared. It is built by closing loops, one after another, over several seasons.

The seed loop — one season

The quickest to close and the most rewarding. Open-pollinated varieties that you harvest and sow again, with the added benefit of gradual adaptation to the local soil and climate. Start with self-pollinating species — tomatoes, beans, peas, lettuce — where accidental cross-pollination is rare. See How to save your seeds.

The fertility loop — two to three years

Compost made from household and garden waste, green manures sown between crops, and mulch produced on-site. The goal is to buy nothing more to feed the soil — achievable in a family vegetable garden, but more difficult over large areas.

The water loop — three to five years

Rainwater harvesting, but above all improving the soil’s water-retention capacity, which is the real reservoir. See Creating a vegetable garden without irrigation.

The energy loop — ongoing

Hand tools, a design that limits travel and interventions, and choosing perennials over annuals wherever possible. This loop never closes completely, but every action eliminated is permanent.

Design principles to know

Holmgren formulated twelve. Five are enough to transform the way you garden.

Observe and interact. One season of observation prevents three years of placement mistakes. Note the sun’s path, prevailing winds, where water stagnates, and which plants grow spontaneously.
Each element performs several functions. A hedge breaks the wind, shelters beneficial organisms, produces fruit, mulch wood, and biomass. If an element in your garden has only one function, there is probably something better to put in its place.
Each function is performed by several elements. This is the principle of redundancy: water comes from rain, the tank, and soil retention. If one of the three is missing, the system holds.
Use edges. Life is densest and most diverse at the boundary between two environments — hedge and meadow, pond and land. A winding edge produces more than a straight line over the same area.
Apply self-regulation and accept feedback. A garden that tells you something — a crop that fails two years in a row, an area that remains untidy — is asking you to change the design, not insist.

Frequently asked questions

Permaculture and organic farming: what’s the difference?

Organic farming is a regulated set of specifications covering permitted inputs, with certification and inspections. Permaculture is a design method, with no label or certifying organization. You can design a permaculture garden without being certified organic, and farm organically in a very conventional way — monoculture, plowing, intensive irrigation, bare soil between rows.

Are raised beds mandatory?

No, and that is the most widespread misconception. Raised beds are one technique among many, relevant for heavy, poorly drained soil or a wet climate; counterproductive in a dry climate or sandy soil, where they cause it to dry out. See Growing in raised beds.

Is it less productive?

Yield per plant is sometimes lower—you plant more densely and do not force growth. But yield per square metre is often higher thanks to density, companion planting, and layering. Above all, working time and inputs decrease significantly after the first two years of establishment, which are demanding.

How long before it works?

Allow two years for the soil to show the first signs—numerous earthworms, a crumbly structure, and a woodland-floor smell—and three to five years for biological balances to become established enough to visibly reduce pest problems.

Can you do it on a balcony?

Design principles apply at every scale: observation, zoning, companion planting, ground cover, and recycling organic matter. “Living soil” in a pot remains limited, but a worm composter and surface mulching are useful approximations. See Creating a permaculture garden in a small space and Balcony vegetable garden.

Key points

Living soil, biodiversity, self-sufficiency: these three pillars are not techniques but directions. You do not “switch to permaculture” overnight—you close loops one by one, observing what the site already offers. And you start with the soil, because everything else depends on it.

Going further

To get started: our open-pollinated heirloom varieties, our green manures, and our starter kits.