The 7 layers of a food forest

The 7 layers of a food forest

A garden that produces an abundance of fruit, vegetables and other useful resources while creating a haven for biodiversity? That’s the promise of a food forest, also called an edible forest garden, inspired by the richness of natural forest ecosystems.

A food forest is made up of several layers of vegetation, each playing an essential role in the system’s overall synergy, offering different services and levels of productivity.

A food forest is designed like a forest edge, letting sunlight reach every level, which supports the growth of each layer. This 7-layer concept was theorised by Robert Hart, a pioneer of permaculture.

1️⃣ Large trees (canopy)

The highest layer is made up of the large trees that dominate the food forest. They provide shade, protect against strong winds, and form the system’s main structure. They play a crucial role in improving the microclimate, supporting moisture retention and reducing evaporation.

A few examples

Common name	Latin name and description
Sweet chestnut	Castanea sativa A long-lived tree producing carbohydrate-rich chestnuts.
Walnut	Juglans regia Produces nuts rich in healthy oils, prefers deep, well-drained soils.
English oak	Quercus robur A majestic tree providing shade and contributing to the microclimate.
Small-leaved lime	Tilia cordata Valued for its pollinator-attracting flowers and its leaves for tea.
Sycamore maple	Acer pseudoplatanus Fast-growing, improves soil quality through its leaf litter.
Common ash	Fraxinus excelsior Used for its quality timber and medicinal properties.
Wild cherry	Prunus avium Produces tasty cherries, attracts many birds.
Field elm	Ulmus minor A hardy tree that stabilises soil and provides habitat for birds.
European beech	Fagus sylvatica Produces edible beechnuts and casts dense shade for the understorey.
Black alder	Alnus glutinosa Nitrogen-fixer, improves fertility in wet soils and attracts bees.

2️⃣ Small trees (sub-canopy)

Beneath the canopy are smaller trees that thrive in the partial shade of the taller ones. These trees often produce smaller fruit or nuts, but are just as valuable for their diversity.

A few examples

Common name	Latin name and description
Apple	Malus domestica Produces versatile apples, suited to countless culinary uses.
Cherry	Prunus avium Produces tasty cherries that also attract birds.
Pear	Pyrus communis Produces juicy pears, well suited to temperate climates.
Plum	Prunus domestica Produces sweet plums, ideal for jam and fresh eating.
Medlar	Mespilus germanica A hardy tree producing medlars, fruit with a unique flavour once bletted.
Quince	Cydonia oblonga Produces quinces, used in jelly or as a side to savoury dishes.
Peach	Prunus persica Produces sweet, juicy peaches, much loved in summer.
Hazel	Corylus avellana Produces nutrient-rich hazelnuts, also useful for attracting squirrels.
Canadian serviceberry	Amelanchier canadensis Produces small sweet berries, eaten fresh or made into jam.
Rowan	Sorbus aucuparia Produces berries prized by birds and supports local biodiversity.

3️⃣ Shrubs

The shrub layer is made up of small bushes that can produce fruit, spices, or medicinal plants. This layer is essential for boosting productivity and providing a diverse harvest throughout the year.

A few examples

Common name	Latin name and description
Blackcurrant	Ribes nigrum A hardy shrub producing vitamin-C-rich berries, ideal for jams and syrups.
Aronia	Aronia melanocarpa Produces antioxidant-rich berries, attracts pollinators and resists disease.
Redcurrant	Ribes rubrum Produces clusters of red berries, rich in vitamin C, used in jam.
Raspberry	Rubus idaeus Produces tasty raspberries, excellent fresh or made into jam.
Elderberry	Sambucus nigra A hardy shrub; its berries and flowers are used in syrup and traditional medicine.
Sea buckthorn	Hippophae rhamnoides Produces berries very rich in vitamin C, often used for juice and jam.
Honeyberry	Lonicera caerulea Produces sweet, juicy berries, enjoyed fresh or in jam.
Cornelian cherry	Cornus mas Produces edible berries, often turned into jelly or jam.
Bilberry	Vaccinium myrtillus Produces tasty bilberries, rich in antioxidants and prized in desserts.
Purple-leaved hazel	Corylus maxima Produces nutritious hazelnuts, its purple leaves adding an aesthetic touch.

4️⃣ Herbaceous plants

Herbaceous plants sit at ground level and include both perennial and annual varieties. This layer is essential for filling empty spaces, protecting the soil and offering a quick harvest.

A few examples

Common name	Latin name and description
Nettle	Urtica dioica A nutritious plant, useful as a liquid feed to strengthen plants, eaten in soup or tea.
Chives	Allium schoenoprasum Easy to grow, repels some pests, a kitchen staple.
Lemon balm	Melissa officinalis A medicinal plant with fragrant leaves, used for its calming properties.
Comfrey	Symphytum officinalis A perennial, used as mulch and to enrich the soil with nutrients.
Chamomile	Matricaria chamomilla Used as an infusion for its soothing, medicinal properties.
Peppermint	Mentha piperita An aromatic plant, used in cooking and for its digestive benefits.
Parsley	Petroselinum crispum var. tuberosum An essential kitchen herb, rich in vitamins.
Dill	Anethum graveolens Used to flavour dishes and attracts beneficial insects.
Sorrel	Rumex acetosa A perennial, adding a tangy note to salads and soups.
Salad burnet	Sanguisorba minor Edible leaves with a cucumber-like taste, used in salads.

5️⃣ Ground cover plants

Ground cover plants form a living carpet, preventing erosion and reducing weed growth. They help retain soil moisture and improve fertility.

A few examples

• Wild strawberry (Fragaria vesca): Provides small, tasty strawberries while efficiently covering the ground. Wild strawberries are also popular with beneficial insects.
• Ground ivy (Glechoma hederacea): Used for its ability to quickly cover large areas. Also known for its medicinal properties, notably as a tea for respiratory conditions.

6️⃣ Climbing plants

This layer makes use of verticality, through plants that climb up trees or support structures. They add a third dimension to the food forest and increase productivity per unit of area.

A few examples

Common name	Latin name and description
Hardy kiwi	Actinidia arguta Perfectly suited to Wallonia’s climate, this hardy kiwi produces sweet fruit.
Grapevine	Vitis vinifera Produces tasty grapes while creating shade when grown on a pergola.
Hops	Humulus lupulus Used in brewing, also a medicinal plant that quickly covers supports.
Passionflower	Passiflora caerulea Spectacular flowers, valued for its fruit and calming properties.
Honeysuckle	Lonicera japonica Flowers abundantly, attracts pollinators, and adds an aesthetic touch.
Old man’s beard	Clematis vitalba Produces many flowers and is used to cover fences and trellises.
Runner bean	Phaseolus coccineus Produces edible beans and enriches the soil with nitrogen.
Chinese wisteria	Wisteria sinensis An ornamental plant producing beautiful, fragrant flower clusters.
Sweet pea	Lathyrus odoratus Flowers in summer with a pleasant scent, attracts bees and other pollinators.
Climbing rose	Rosa spp. Produces fragrant roses and vitamin-C-rich rose hips.

7️⃣ Roots and rhizomes

This layer groups plants that develop edible or medicinal roots, making use of the food forest’s underground space. These plants are often robust and help aerate the soil.

A few examples

Common name	Latin name and description
Jerusalem artichoke	Helianthus tuberosus Produces nutritious tubers and attracts pollinators with its large yellow flowers.
Horseradish	Armoracia rusticana A pungent root used as a condiment, good for digestion.
Comfrey	Symphytum officinale Used for its medicinal properties and as a green manure to enrich the soil.
Scorzonera	Scorzonera hispanica An edible root with a lightly sweet taste, often cooked as a root vegetable.
Oca	Oxalis tuberosa Produces edible tubers, rich in vitamin C, used in cooking.
Perennial leek	Allium ampeloprasum A perennial producing leeks usable year-round.
Wild carrot	Daucus carota An edible root, ancestor of the cultivated carrot, flowers to attract pollinators.
Sweet potato	Ipomoea batatas Produces sweet, nutrient-rich, energy-dense tubers.
Ginger	Zingiber officinale A root used for its medicinal properties and spicy flavour in cooking.
Wild garlic	Allium ursinum Edible, fragrant leaves and bulbs, prized in cooking for their garlicky flavour.

Choosing plants for each layer

When choosing plants for each layer of your food forest, it’s essential to weigh several criteria to ensure your ecosystem succeeds.

Here’s specific guidance for each layer:

1. Large trees (canopy): Choose trees suited to your climate and soil. Trees like chestnut or walnut are ideal for deep, well-drained soils. Also consider food production — nuts or fruit — and their ability to improve the microclimate.

2. Small trees (sub-canopy): For this layer, favour species that tolerate some shade, like apple or plum. Diversify varieties to spread the harvest across the season. These trees often produce fruit and contribute to biodiversity.

3. Shrubs: Select shrubs that offer fruit or spices. Species like blackcurrant, aronia or elderberry are worthwhile — productive and disease-resistant. Shrubs are also useful for attracting pollinators and birds.

4. Herbaceous plants: Choose herbaceous plants for their ability to protect the soil and for their many uses (culinary, medicinal). For example, nettle is very useful for enriching the soil, while chives and lemon balm are excellent for cooking and tea.

5. Ground cover plants: Choose plants that cover the ground effectively, keeping weeds from spreading. Wild strawberry and white clover are good choices. They help retain moisture and improve soil fertility.

6. Climbing plants: Climbing plants should be chosen for their ability to make use of vertical space. Kiwi and grapevine are perfect for creating a productive vertical dimension. These plants can climb trees or structures and add harvest diversity.

7. Roots and rhizomes: Plants in this layer, like Jerusalem artichoke or ginger, should be chosen for their ability to adapt to your soil. Favour species that can enrich the soil or provide regular harvests. Root plants are also essential for aerating the soil and improving its structure.

Common design mistakes

When designing a food forest, certain mistakes come up again and again and can undermine the ecosystem’s success. Here are some of the most common mistakes for each layer.

Large trees (canopy)

Common mistake	Explanation
Not enough space for the trees	Large trees need plenty of light and room to spread.
Planting too densely	Excessive density causes competition for light and nutrients.

Small trees (sub-canopy)

Common mistake	Explanation
Choosing shade-intolerant trees	Small trees need to tolerate reduced light conditions.
Planting without considering light needs	Trees under the canopy need specific light conditions.

Shrubs

Common mistake	Explanation
Lack of diversity	Plant several species to ensure a year-round harvest and minimise disease.
Poor fit with the ecosystem	Some shrubs may not integrate well without careful attention to their needs.

Herbaceous plants

Common mistake	Explanation
Not covering the soil enough	Leaving empty spaces encourages weeds to spread.
Using unsuited plants	Some herbaceous plants aren’t hardy enough to hold the space long-term.

Ground cover plants

Common mistake	Explanation
Planting ground cover unsuited to shade	Choose plants suited to the available light to ensure success.
Neglecting initial care	Early on, support is needed to help ground cover plants establish.

Climbing plants

Common mistake	Explanation
No support provided	Climbing plants need structures to climb and develop.
Choosing invasive climbers	Some climbing plants can overrun other layers if left unchecked.

Roots and rhizomes

Common mistake	Explanation
Planting invasive species	Some root plants can invade the garden and compete with others.
Lack of growth control	Some species spread quickly and need management to avoid becoming invasive.

Conclusion

A food forest, with its seven layers, is a nature-inspired system that can provide an incredible diversity of resources. By selecting species suited to your region, it’s possible to create a resilient, productive ecosystem that supports biodiversity.

Each layer contributes to the richness of the whole, allowing you to harvest fruit, vegetables, spices and other resources throughout the year, while supporting pollinators and other forms of life.

By establishing a food forest, you take part in building a more resilient community and restoring local ecosystems, all while enjoying delicious, diverse harvests.

To go further

Check out our plant database.

Article published by Semisto on 7 October 2024

Co-authors

Michael Hulet

Header photo

Une Figue dans le Poirier (Vosges)