Sorbus alnifolia

RHS Plant Profile
Korean mountain ash

Synonyms

Sorbus zahlbruckneri misapplied

Trees

A large, deciduous tree up to 20m tall. Its upright branches form a neat, rounded canopy whilst its bark is unusual, being dark or pale grey, finely-striped in buff. Leaves are dark green, ovate, up to 9 x 6cm, on red leaf-stalks, and turning yellow in autumn. A proliferation of white flowers, 1cm wide, are produced in spring. Clusters of berries in autumn turn from orange to red and are held on the tree well after leaf fall

Position

Full sun, Partial shade

Soil Types

Loam, Sand

Max Height

Higher than 12 metres

Max Spread

4-8 metres

Size

Time to Maturity
20–50 years
Max Spread
4-8 metres
Max Height
Higher than 12 metres

Growing Conditions

Loam Sand
Moisture
Well–drained
pH
Acid or Neutral

Position

Full sun Partial shade
Aspect
South–facing or North–facing or East–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Rosaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Potentially harmful
Fruit are ornamentalnot to be eaten. Wear gloves and other protective equipment when handling. Pets: Fruit are ornamentalnot to be eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus
Sorbus can be deciduous trees or shrubs with simple or pinnate leaves and clusters of small white or pink flowers, followed by white, yellow, pink, red or brown berries; some have fine autumn colour
Name Status
Correct
Plant Range
E Asia

How to Grow

Cultivation

Grow in moderately-fertile, humus-rich soil. Tolerant of atmospheric pollution; ideal specimen tree in small garden, wild or woodland garden

Propagation

Propagate by seed, softwood cuttings or grafting

Suggested planting locations and garden types

  • Wildlife gardens
  • Low Maintenance

Pruning

Pruning group 1

Pests

May be susceptible to aphids, scale insects, pear blister mite, red spider mite and sawfly larvae

Diseases

May be susceptible to fireblight, apple canker, silver leaf and honey fungus