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TREES & Plants

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): 
Rose
Family (Botanic): 
Rosaceae
Tree or Plant Type: 
  • Tree
Foliage: 
  • Deciduous (foliage falls off)
Native Locale: 
  • Non-native
Hardiness Zones: 
  • Zone 4
  • Zone 5
  • Zone 6
  • Zone 7
Growth Rate: 
  • Medium
  • Fast
Light Exposure: 
  • Full sun (6 hrs direct light daily)
Tolerances: 
  • Alkaline soil
Soil Preference: 
  • Moist, well-drained soil
Flower Color & Fragrance: 
  • White
Size Range: 
  • Large tree (more than 40 feet)
  • Medium tree (25-40 feet)
Shape or Form: 
  • Oval
  • Pyramidal
Landscape Uses: 
  • Specimen
  • Shade
Time of Year: 
  • Mid spring
  • Late spring
  • Mid summer
  • Late summer
  • Early fall
  • Mid fall
More Information: 

Size

35 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

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.

Korean mountain-ash (Sorbus alnifolia)Korean mountain-ash (Sorbus alnifolia)photo: John Hagstrom

Fruit, cone, nut, and seed descriptions

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