What can I grow in dry shade under a tree?
Why the ground under a tree is the hardest place in a garden, the planting technique that works there, and the plants that genuinely cope.
- Difficulty
- intermediate
- Time
- 1 hr 30 min
- Read
- 3 min
Short answer
The problem is competition, not shade. Tree roots take the water and nutrients first. Plant small plants in autumn, water them through two summers, mulch generously every year, and choose from the short list that actually tolerates it — epimedium, geranium macrorrhizum, euphorbia amygdaloides, dryopteris, bergenia and hardy cyclamen.
People usually try to solve dry shade with shade-tolerant plants and are surprised when they die anyway. Shade tolerance and drought tolerance are separate qualities, and this position demands both.
What you'll need
- Small plants, not large ones
- Compost and mulch
- Watering can
- Leaf mould (optional)
Step by step
- Understand the constraint.A mature tree removes hundreds of litres of water a day from the soil around it. Anything planted underneath is competing with an established root system that always wins.
- Do not dig the root zone over.Cutting through tree roots damages the tree and does not help for long. Plant into pockets between roots rather than cultivating the whole area.
- Plant small.A 9cm pot establishes far better under a tree than a 3 litre one, because it needs less water to get going and its roots grow into the space rather than sitting in a dry hole.
- Plant in autumn.Autumn planting gives months of winter rain and cool weather to establish before the tree starts drawing water again in spring. Spring planting under a tree usually fails.
- Improve the planting pocket only.Mix compost into the individual hole rather than trying to improve the whole area, which is impossible without damaging roots.
- Water for two full summers.A can per plant per week through the first two growing seasons. This is not optional in dry shade and it is what separates success from failure.
- Mulch generously every year.50 to 75mm of leaf mould or compost each autumn, kept clear of the trunk. It is the only realistic way to keep improving the soil without digging.
- Choose the reliable performers.Epimedium, geranium macrorrhizum, euphorbia amygdaloides var. robbiae, dryopteris ferns, bergenia, vinca, lamium, hellebore, hardy cyclamen and pulmonaria all genuinely cope.
- Use spring bulbs for a season the tree is not using.Snowdrops, winter aconites, anemone blanchoda and cyclamen do their growing before the tree comes into leaf, which sidesteps the problem entirely.
- Consider not planting at all.A mulched circle, a bench, a few large pots or a bark path under a tree is a legitimate and low-maintenance answer, and often looks better than a struggling border.
Tips
- Shade tolerance and drought tolerance are different things. Dry shade needs both.
- Small plants in autumn establish where large plants in spring die.
- Spring bulbs work under trees because they finish before the tree starts.
Common mistakes
- Adding a thick layer of topsoil over the tree's root zone to plant into — Burying tree roots deprives them of air and can kill the tree over several years. Mulch in thin annual layers instead.
- Planting large expensive specimens for instant effect — Large plants have a large water demand and a rootball that stays as a dry lump. They fail far more often than small plants in the same spot.
If it doesn't work
Everything planted dies in its first summer
Cause: Root competition and no watering regime — Fix: Plant smaller, in autumn, and water weekly for two seasons.
Plants survive but never grow
Cause: Insufficient water and nutrients — Fix: Annual mulch, spring feed, and accept slower growth than in open ground.
Ground bare and dusty
Cause: Dense evergreen canopy such as conifer or holly — Fix: Some canopies are effectively unplantable. Use pots, bark, or crown-lift the tree if appropriate.
Tree looking worse since planting
Cause: Roots damaged or buried during cultivation — Fix: Stop cultivating. Mulch only, and water the tree in dry spells.
Questions people ask
What is the single best plant for dry shade?
Geranium macrorrhizum for ground cover and euphorbia amygdaloides var. robbiae for something taller. Both spread, both cope, and both need almost nothing once established.
Can I improve the soil under a tree?
Only by mulching from above, in thin annual layers. Digging cuts roots and damages the tree, and adding a thick layer of soil suffocates them.
Would grass grow there instead?
Usually badly, for the same reasons. A mulched circle or a groundcover planting is nearly always a better answer than struggling turf under a tree.