Sorbus alnifolia

Korean Mountainash

Rosaceae

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Habitat

  • native to central China, Korea and Japan
  • hardy to zone 4

Habit and Form

  • a deciduous tree
  • 40' to 50' tall
  • 20' to 30' wide
  • pyramidal in youth
  • broad, rounded crown when mature
  • medium texture
  • medium growth rate

Summer Foliage

  • alternate leaf arrangement
  • simple, deciduous leaves
  • 2" to 4" long
  • ovate leaf shape
  • unequally serrated leaf margins
  • fine pubescence
  • dark green leaf color

Autumn Foliage

  • yellow to golden brown fall color

Flowers

  • white flowers
  • 0.5" in diameter
  • borne in corymbs, 2" to 3" across
  • 6 to 10 flowers clustered in corymbs
  • blooms in May

Fruit

  • rounded pome
  • pinkish red to red
  • matures in September
  • persist

Bark

  • gray bark color
  • smooth
  • reddish brown stems with gray lenticels

Culture

  • transplant from B&B
  • prefers well-drained soil
  • Ph adaptable
  • prune in winter

Landscape Use

  • specimen tree
  • park tree
  • large open area

Liabilities

  • stress predisposes the plant to disease and insect problems
  • very susceptible to borers
  • frequently develops fireblight
  • other insect and disease pests include cankers, rusts, aphids, sawflies, and scales
  • often short-lived in the landscape

ID Features

  • diamond shaped lenticels on older bark
  • terminal buds are oblong, sessile and pubescent
  • ovate leaf shape
  • white flowers in corymbs
  • red fruit

Propagation

  • by seed

Cultivars/Varieties

'Redbird' (probably the same as 'Skyline') - This is an upright-columnar form with red, persistent fruit and good yellow fall color. It is not seen commonly in commerce.

© Copyright Mark H. Brand, 1997-2015.

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Citation and Acknowledgements: University of Connecticut Plant Database, http://hort.uconn.edu/plants, Mark H. Brand, Department of Plant Science and Landscape Architecture, Storrs, CT 06269-4067 USA.