In the pathway: Understanding companion planting
Apple tree guild
Complementary roles around the fruit tree.
The guild's plates
Introduction
A guild is an assembly of plants each chosen to take on an ecological function around a central species. The apple tree guild surrounds the tree with plants that cover the soil, provide mulch and feed pollinators.
Background
In nature, a tree is never alone: it grows with a retinue of companion plants, fungi and insects. Applying this logic in the garden can lighten upkeep (weeding, watering); its effects on the tree's health are still to be assessed in practice.
Who this guide is for
Anyone planting a fruit tree (family garden, conservation orchard, greened base of an apartment block). Designed for the apple, this guild carries over to the pear by adapting spacing and rootstock; for a plum or cherry, think in roles and check each companion.
Why it matters
An apple tree in a guild has covered soil, flowers for pollinators and beneficials, and mulch produced on the spot, which can reduce weeding and inputs. Against codling moth, perennial flower strips sown between the rows reduced damage in organic orchards in seven European countries (Cahenzli et al., 2019); the effect of a small guild at the foot of a single tree, against codling moth as against scab, remains to be judged on the ground. It is also a refuge for biodiversity.
What to understand before starting
- An apple tree already planted (or to be planted in autumn, bare-rooted).
- Companion plants: Bocking 14 comfrey, white clover, garlic, tansy, borage, phacelia, thyme, strawberry.
- Mature compost and mulch (ramial chipped wood, RCW, ideally).
Detailed steps
- Step 1
Choose a hardy variety
Favour old local varieties (Belle de Boskoop, Reinette, Court-Pendu), more resistant than commercial cultivars.
- Step 2
Mark out the zone
Draw around the trunk a circle the size of the adult crown, which depends on the rootstock: smaller for a dwarf apple, larger for a half-standard. The guild sits within it.
- Step 3
Set up the shrub layer
At 1.5 m from the trunk, plant 1 or 2 redcurrants or blackcurrants: they tolerate the apple's part shade and draw in bumblebees early in the season.
- Step 5
Sow the nitrogen-fixing ground cover
In the circle, sow dwarf white clover as a carpet between the companions, keeping the foot of the trunk mulched for the first years: the clover competes with the young tree for water and nitrogen. It covers the soil, flowers for the bees and fixes nitrogen mainly for itself; it returns part of it to the soil, mostly when it is mown and the residues left in place (Reay et al., 2022).
- Step 6
Arrange the repellents
Plant 6 to 8 garlic cloves (or chives) in a ring and 1 tansy plant. These are traditional companions reputed to repel pests; against codling moth, see instead the means on its entry (nets, trap bands, tits).
- Step 8
Complete with useful ground covers
Thyme (nectar-rich, reputedly repellent) and wild strawberry (edible ground cover) on the remaining spaces.
Concrete examples
- Small garden, around a dwarf apple tree: 1 redcurrant, 1 comfrey, 6 garlic, 1 tansy, 1 m² of clover.
- Family orchard, around a half-standard apple tree: 2 blackcurrants, 3 comfreys, 12 garlic, 2 tansies, a borage + phacelia + thyme edge.
Common mistakes to avoid
- Planting the companions too close to the trunk: leave at least 50 cm.
- Choosing ordinary comfrey instead of Bocking 14 (which does not self-seed and does not spread).
- Letting the clover reach the foot of a young tree: keep mulch around the trunk, mow the clover and leave the residues in place.
- Forgetting that the guild takes 2 to 3 seasons to come into full function. Patience!
Tips & best practices
- Cut the comfrey 3 to 4 times a year to produce a rich mulch, left in place.
- Set up a tit nest box nearby: they eat codling-moth caterpillars.
- Pick up fallen fruit quickly to break the pests' cycle.
Frequently asked questions
- What if I have several apple trees?
- Make one guild per tree, and link them with continuous flowering strips: you create an ecological corridor.
- Will the white clover smother the comfrey?
- No, the comfrey is taller and more vigorous. The clover stays flat on the ground.
- Can I replace the tansy?
- Yes, with wormwood, another bitter aromatic with a repellent reputation, kept along the edge. Against codling moth, rely instead on the means described on its entry.
Key takeaways
- A guild combines several roles: centre, shrub layer, biomass, nitrogen fixer, reputed repellent, pollinator, ground cover.
- Patience: full function in 2 to 3 seasons.
- Bocking 14 comfrey provides a potassium-rich mulch on the spot.
Sources
- Cahenzli, F. et al. (2019). Perennial flower strips for pest control in organic apple orchards: a pan-European study. Agriculture, Ecosystems & Environment, 278, 43-53.
- Reay, M.K. et al. (2022). Mechanisms of nitrogen transfer in a model clover-ryegrass pasture: a 15N-tracer approach. Plant and Soil, 480, 369-389.
- Hemenway, T. (2009). Gaia's Garden: A Guide to Home-Scale Permaculture (2e éd.). White River Junction : Chelsea Green.