Plant berry shrubs and perennial vegetables early, because they bear within a few years while the trees above them are still small, and give each its own light by keeping shrubs to the sunny gaps and herbs to the edges and openings. Shrubs of 3-10 ft such as currant, gooseberry, raspberry and hazelnut carry the planting’s first harvest, while herbaceous perennials under 3 ft such as rhubarb, asparagus and sorrel give a salad and vegetable layer that returns each year without replanting. Both layers lose output as the canopy closes, so plan to replace or move them rather than expect them to stay productive in deep shade.
The shrub layer is the berry and nut bushes that grow at 3-10 ft, and the herbaceous layer is the perennial vegetables, herbs and flowers below 3 ft.
These Two Layers Give The First Harvest And Lose It To Shade
The carrier guide expects the shrub layer to begin producing berries by year 2-3 and asparagus by year 3, long before nut trees bear. That makes these layers the early return on the planting. They are also the ones the canopy eventually crowds: when the trees close over, light under them falls, and sun-loving berries decline.
What Belongs In Each Layer
The carrier lists, for the shrub layer, blueberry, raspberry, blackberry, currant, gooseberry, elderberry, hazelnut (for nuts and for stakes), rose hips (vitamin C) and Siberian pea shrub, a nitrogen fixer. For the herbaceous layer it lists rhubarb, asparagus, sorrel, Good King Henry, perennial kale and Jerusalem artichoke as food, with yarrow and chamomile as utility plants and white clover, vetch and lupine as nitrogen fixers.
Blueberries need acid soil and the carrier gives no pH guidance; test your soil before planting them (pH Testing). Raspberries and blackberries spread by suckers and can take over a bed. Jerusalem artichoke is hard to remove once established.
Method: Siting And Managing
Step 1: Put the sun-demanding shrubs in the gaps. Berries need several hours of direct sun to bear well; the carrier’s partial-shade band is 3-6 hours. Map the gaps at midsummer and midwinter.
Step 2: Plant herbs in clumps, not scattered, so you can find, harvest and weed them. Asparagus and rhubarb occupy the same spot for many years, so site them where you will not need to dig.
Step 3: Mulch heavily in the first years and keep mulch off crowns and canes.
Step 4: Cut and harvest to keep light moving. Prune old canes of raspberries and blackberries after fruiting, thin crowded shrubs, and divide perennials.
Step 5: Plan the swap. As the canopy casts more shade, move sun-loving berries to new gaps or replace them with shade-tolerant species (gooseberry and currant tolerate more shade than many other fruits; check locally).
Common Mistakes
- Letting a spreader run — Jerusalem artichoke, mint and raspberry colonise an entire bed. Plant them where you can contain them.
- Planting acid-lovers in alkaline soil — blueberries decline or die; test first.
- Eating the wrong part — rhubarb leaves are poisonous and raw elderberries are toxic (see the safety note).
Safety
Rhubarb leaves and raw elderberries are poisonous
Eat only rhubarb stalks, never the leaves. Cook elderberries; raw berries, leaves, stems and bark are toxic. Comfrey is a mulch plant, not a vegetable. Label the bed.
What’s Next
- Learn next: Ground Cover and Root Crops — the layers beneath these
- Combine with: Year 3-7: Early Production — when these layers peak