Mountain Ash

How to grow Mountain Ash

Written by the GardenDecoded editorial team · Last reviewed 21 July 2026 · Written for UK gardens · How we research our guidance

Planting

Plant bare-root between November and March, or container-grown at any time the ground is workable. It is one of the better small trees for a modest garden — narrow, light-canopied and not greedy at the root. Stake for the first two years on exposed sites.

Pruning

Needs almost none. Take out dead, damaged or crossing branches between late autumn and midwinter, and resist the urge to shape it — the naturally open habit is the point.

Propagation

Sow berries in autumn after removing the flesh, in pots left outdoors over winter; germination usually follows the second spring. Named forms are grafted and will not come true from seed.

Pests and diseases

Fireblight can kill shoots back rapidly in warm wet weather, showing as blackened, scorched-looking growth — cut well back into clean wood and disinfect tools. Sawflies and aphids occur but rarely need action.

Value to wildlife

The flat white flower heads draw hoverflies and beetles in late spring, and the berry crop is stripped by blackbirds, thrushes and visiting redwings and fieldfares, often within days of ripening.

Notes

It is short-lived by tree standards and struggles in hot, dry city sites with compacted soil. It performs best in cooler and northern gardens, and colours well in autumn on acid ground.

This guidance was researched and written by GardenDecoded — see our editorial policy for how guides are checked and reviewed.

Other names for this plant

These names have all been used for Sorbus aucuparia but are no longer the accepted name. You may still meet them on old labels, in books, or in nursery catalogues.

Others in Sorbus