A whole lot of life. On every level.

Large trees shape the light, shelter and growing space below. Choose for your climate and mature width—not the size of the pot at the nursery. A small garden may sensibly skip this layer entirely.

Many nut trees need considerable space and compatible pollination. Shade can help some plants while reducing fruiting in others. Leave room for access, buildings and neighbouring land, and avoid replacing valuable existing habitat just to complete a diagram.

Smaller trees can form the highest layer in a compact garden. Small size does not imply shade tolerance: many fruit trees crop best in sun. Match the species, cultivar and rootstock to the actual light and climate.

Pawpaws can tolerate shade, but tolerance and a good fruit crop are different goals. Give every tree enough space for its mature crown and enough access for pruning and picking. Layer names describe form, not a universal planting prescription.

Berries make this an inviting layer, but different shrubs have different needs. Blueberries require acidic soil; raspberries can spread and need management. Check each crop before putting it in the same bed.

Some currants tolerate partial shade; that does not make every berry shrub a woodland-floor crop. Local climate, disease restrictions and invasive status matter. Choose species and cultivars with guidance for your region rather than copying the whole list.

Non-woody plants add herbs, greens and flowers between larger plants. Choose for compatible light and water needs, leave harvesting room, and check the edible part and preparation of each species.

A leafy plant is not automatically a soil cure. Comfrey can provide cut material, but claims that it reliably mines missing minerals for neighbouring plants are not established by calling it a “dynamic accumulator.” Read the plant roles guide before choosing support species.

Low plants can cover soil and provide flowers or food. They also use water and nutrients. Around a new tree, a mulched establishment area may be more helpful than a dense carpet of living competitors.

Choose a spreader you can manage. Thyme and strawberries do not want identical conditions; check the crop and climate rather than treating “ground cover” as a care category. Some open soil can also serve ground-nesting insects, so do not assume every square centimetre needs planting.

Roots, bulbs and tubers grow below ground, where the roots of every other layer already live. They can compete for resources, and digging a crop beside a tree can damage its roots. Use accessible dedicated pockets or beds.

Some underground crops are annuals or need replanting after harvest. Jerusalem artichoke can spread vigorously. The rhizosphere technically means the soil influenced by roots; in garden diagrams, “root layer” is a convenient shorthand rather than a separate, competition-free storey.

Climbers use trellises and other supports to reach the light. Give vigorous vines a structure that can carry their mature weight, and check pruning and harvest access. A young fruit tree is not a free trellis.

Grapes and other climbers can shade and compete with nearby plants. Use a suitable non-invasive species, keep it within bounds and check pollination needs. Annual beans are an option for learning about vertical growing without making a decades-long commitment.