What is a Plant Guild?

In brief

A mutually supportive grouping assembled around a central element, which may be a plant, an animal, or a structure such as a pond.

In the whole: Principles at work 3 Obtain a yield, 4 Apply self-regulation and accept feedback, 8 Integrate rather than segregate, 10 Use and value diversity

A journey through permaculture: 8. Plants and systems

Chapter 8 of 12 · Page 2 of 15

What is a plant guild?

A plant guild is a group of plants, and sometimes animals, assembled so that the members benefit one another. The idea borrows from ecology, where a "guild" is a set of species that exploit the same resources in similar ways; in garden and farm design it is used more deliberately, to build a small, largely self-supporting community around a plant we want to grow. The centre does not have to be a plant. In the permaculture literature a guild is assembled around a central element, and that element may equally be an animal or a built structure: the community of plants around a pond, around a chicken run, or against the warm south wall of a house is a guild in exactly the same sense.

A classic guild forms around a central tree. Around and beneath it sit companions chosen for the functions they perform: nitrogen-fixing shrubs that feed the soil, deep-rooted plants that lift minerals from below, flowering herbs that draw in pollinators and the insects that prey on pests, aromatic plants that confuse browsing animals, and low ground covers that shade the soil and suppress weeds. Each member does a job that would otherwise fall to the gardener (fertilising, mulching, pest control) so the group as a whole needs fewer outside inputs.

Guilds are one of the ways permaculture translates the observation that healthy ecosystems are built on relationships, not isolated individuals. Rather than growing a tree in bare, weeded ground, the designer surrounds it with the web of partners it would tend to gather in a maturing natural system, only chosen and arranged on purpose.

How Terra Humana understands the plant guild

For Terra Humana, the guild is a small, practical picture of the foundation's larger conviction: that life does better in community than in isolation. A tree standing alone in cleared soil depends on constant outside care; a tree embedded in a working guild is held up by its neighbours. We find in that a quiet lesson about people as much as plants.

We treat guild design as observation before arrangement. Which companions actually help depends entirely on the place: the soil, the climate, the water. We are cautious about copying guild "recipes" from wetter, cooler regions, and instead build our groupings from species that prove themselves under Sardinian conditions, correcting the textbook where the land disagrees with it.

Plant guilds in practice

At Sa Medada, near Jerzu in the Ogliastra region of Sardinia, the growing areas of Project Eden are meant to develop as guilds rather than rows of single crops. The idea is a fruit or nut tree at the centre, with nitrogen-fixing companions, deep-rooted nutrient plants and hardy ground covers suited to heat and drought placed around it. So far a beginning is documented: a Leucaena as nurse over two avocados.

The central challenge here is water and shade. On dry, stony ground a young tree left in bare soil bakes and struggles; a guild that covers the soil, holds moisture and shelters the trunk gives it a far better chance through its first summers. Companions are chosen not for their fame in permaculture books but for their tolerance of the Mediterranean dry season.

This work is still young, an experiment in progress. We want to learn which guild members thrive at Sa Medada and which fail. What we record about what actually holds together on hard Sardinian land is meant to become part of the knowledge Project Eden exists to produce.

Sa Medada

What this looks like at Sa Medada

The beginnings of a guild are already documented at Sa Medada, on a small scale: a Leucaena, now two metres tall, stands as nurse over two avocados. It gives shade, supplies cuttings and can fix nitrogen once it has found its root-nodule bacteria. Whether the avocados grow better beneath it than in the open is something we intend to measure.

More about Project Eden

Plants in this entry

Frequently asked

What is a plant guild?

A plant guild is a group of plants deliberately chosen and arranged so that they support one another. Typically a central element, often a fruit tree, is surrounded by companions that fix nitrogen, draw up nutrients, attract pollinators, deter pests or cover the soil, so the whole group needs less feeding, weeding and watering than the plants would alone.

How does Terra Humana use plant guilds?

At Project Eden in Sardinia, fruit and nut trees are meant to grow inside guilds of supporting species rather than as isolated specimens. The plan is to place nitrogen-fixers, deep-rooted nutrient plants and ground covers around the trees to build soil, hold moisture and shade the ground through the dry Mediterranean summer. So far one small beginning is documented: a Leucaena stands as nurse over two avocados.