Korean mountain-ash

Spring flowers of Korean mountain-ash.

Korean mountain-ash is a medium sized tree with interesting ornamental features.  The tree flowers white in spring and the white flowers are followed by red fruit.  Yellow fall color and gray bark complete the picture.  This tree does best in a lawn situation.  Streets and city sites should be avoided.

Botanical name:

Sorbus alnifolia

All Common Names:

Korean mountain-ash, Korean mountainash

Family (English):


Family (Botanic):


Tree or Plant Type:

  • Tree


  • Deciduous (seasonally loses leaves)

Native Locale:

  • Non-native

Landscape Uses:

  • Specimen,
  • Shade tree

Size Range:

  • Large tree (more than 40 feet)

Light Exposure:

  • Full sun (6 hrs direct light daily)

Hardiness Zones:

  • Zone 4,
  • Zone 5 (Chicago),
  • Zone 6,
  • Zone 7

Soil Preference:

  • Moist, well-drained soil

Season of Interest:

  • Mid spring,
  • Late spring,
  • Mid summer,
  • Late summer,
  • Early fall,
  • Mid fall

Flower Color & Fragrance:

  • White

Shape or Form:

  • Oval,
  • Pyramidal

Growth Rate:

  • Moderate,
  • Fast

More Information:


40 to 50 feet high and 20 to 30 feet wide.

Tree & Plant Care

Generally a short-lived tree.
Avoid polluted and dry sites.

Disease, pests, and problems

Fireblight, canker, rust, scale insects and borers.
May be difficult to find in nurseries.

Native geographic location and habitat

Korea, Japan and China

Bark color and texture 

Bark is smooth and gray.

Leaf or needle arrangement, size, shape, and texture

Simple leaf (unusual as most mountain-ash species have compound leaves); alternate on the twig; oval with unequal teeth around the edges. 
Fall color is mix or yellow, orange and brown.

Flower arrangement, shape, and size

Small, white flowers in a flat-topped cluster, 2 to 3 inches in diameter.

Fruit and fall color of Korean mountain-ash.
Korean mountain-ash (Sorbus alnifolia)
photo: John Hagstrom

Fruit, cone, nut, and seed descriptions

Red, berry-like pomes in clusters, late summer into fall.



Location of Sorbus alnifolia (Korean mountain-ash) at the Arboretum