Shrubs, trees and climbers

Rowan

SorbusRosaceae
Also: Mountain ash, Sorbus
AT A GLANCE
Part shade Water: average H6down to −20 °C 6–10 m tall · 4–6 m wide In a pot: yes
Flowering · UK
Flowering · Northern Italy
Flowering · Central Italy
Flowering · Southern Italy and islands

Stake for the first two years on an exposed site, and water well through the first two summers.

Care

Light

Tolerates cold, exposed sites well.

Water

Reliably drought-tolerant once established.

Soil

Adaptable soil of most types, including poor or acidic ground.

Pruning

Minimal — formative pruning only while young, in winter while dormant.

Feeding

No feeding needed — rowans are native to thin upland soils and grow perfectly well without. A young tree wants a mulched, grass-free circle rather than fertiliser.

Propagation

From seed: clean the flesh off the berries and sow outdoors in autumn so the seed gets a natural winter. Named forms are grafted, so seedlings vary in berry colour and habit.

Month by month

Months change with the climate: in southern Italy tomatoes go out two months earlier than in England.

  1. JanuaryFormative pruning while young and fully dormant. how ›
  2. MayEnjoy the white spring flowers.
  3. SeptemberEnjoy the autumn berries and leaf colour — an important food source for birds.

Months based on climate: UK. Your choice stays on this device.

  1. JanuaryFormative pruning while young and fully dormant. how ›
  2. MayEnjoy the white spring flowers.
  3. SeptemberEnjoy the autumn berries and leaf colour — an important food source for birds.

Months based on climate: Northern Italy. Your choice stays on this device.

  1. JanuaryFormative pruning while young and fully dormant. how ›
  2. AprilEnjoy the white spring flowers.
  3. SeptemberEnjoy the autumn berries and leaf colour — an important food source for birds.

Months based on climate: Central Italy. Your choice stays on this device.

  1. JanuaryFormative pruning while young and fully dormant. how ›
  2. AprilEnjoy the white spring flowers.
  3. OctoberEnjoy the autumn berries and leaf colour — an important food source for birds.

Months based on climate: Southern Italy and islands. Your choice stays on this device.

Common problems

Fireblightfull sheet ›

How to spot it. Blackened, scorched-looking blossom and shoots.

What to do. Cut out well below the affected area, disinfect tools.

How to spot it. Orange spots on leaves.

What to do. Rake up and dispose of fallen leaves; rarely serious.

Woolly aphid

How to spot it. White, fluffy patches on bark.

What to do. Treat if severe.

Questions

Rowan: is it hardy?

H6: Hardy in the vast majority of UK gardens. It survives down to −20 °C.

Can it grow in a pot?

Can be grown in a large pot for a few years while young.

Rowan: when do you prune it?

Minimal — formative pruning only while young, in winter while dormant. In the calendar for UK, pruning falls in January.

Rowan: when does it flower?

In the climate of UK it flowers in May.

When do you feed it?

No feeding needed — rowans are native to thin upland soils and grow perfectly well without. A young tree wants a mulched, grass-free circle rather than fertiliser.