Sorbus alnifolia

Korean mountain ash

  • © Missouri Botanical Garden Kemper Center PlantFinder/www.mobot.org

  • © Missouri Botanical Garden Kemper Center PlantFinder/www.mobot.org

Outstanding Qualities

This simple, yet elegant medium-sized tree has handsome foliage and delicate clusters of white flowers in springtime. Autumn brings brilliant orange-red to scarlet fruit and splashy fall leaf color. Dark green leaves are serrated along the edges and the attractive bark is smooth and a silvery dark gray.

Quick Facts

Plant Type: tree

Foliage Type: deciduous

Plant Height: 20 ft. 0 in. (6.10 meters)

Plant Width/Spread: 15 ft. 0 in. (4.57 meters)

Plant Height-Mature: 50 ft. 0 in. (15.24 meters)

Plant Width-Mature: 25 ft. 0 in. (7.62 meters)

Hardiness: USDA Zones 4 to 8

Flower Color: white

Sun/Light Exposure: full sun or light shade

Water Requirements: occasional watering

Seasonal Interest: spring flowers, autumn berries & foliage color

Wildlife Associations: bees, butterflies

Colors & Combos

Great Plant Combinations: Rhododendrons, Vaccinium ovatum (evergreen huckleberry), hellebores, and other woodland-type plants make appealing companions.

Great Color Contrasts: gold, red, orange

Great Color Partners: dark green, variegated, blue

Culture Notes
Korean mountain ash grows best in well-drained or sandy soil with full sun. Once established it will only need occasional watering during dry weather. Little pruning is needed to maintain its form, remove any dead, broken or poorly formed limbs.