Sorbus alnifolia- Korean Mountain Ash


General: Pyramidal to oval deciduous tree growing 40 to 50’ by 20 to 30’.

Leaves: Alternate, simple and 2 to 4” long, resembling beech or hornbeam leaves. Leaves emerge bright green, turn dark green during the summer and mature to a yellow golden fall color.

Bark: Gray, lenticeled beech like in appearance.

Flowers: 2 to 3” flat topped white clusters appear in May.

Fruit: A pinkish red to orange red pome up to 5/8” long appear in the fall. Very ornamental.

Attributes:  An ideal specimen tree for multi seasonal interest.


Hardiness:  Zones 4-7

Growing Conditions: Prefers average well drained soils in full sun to part shade. Does not tolerate pollution or high night temperatures.

Maintenance: Trees in the sorbus family are susceptible to many insect and disease pests, but Korean mountain ash is the least susceptible to borer injury that’s common to others. Common pests are fire blight, canker, rusts, aphids, sawfly, and scale.

Transplanting: Easily transplanted due to adaptability to areas with little pollution and cool climate.

Our Experience

Experience at Great Hill

Korean mountain ash is an outstanding tree for specimen use with year round interest and adaptability to soils. Not resembling others in its family, its often hard to ID and underutilized in the industry. Currently not growing on Great Hill.