Photo by Melody

PlantFiles: Korean Mountain Ash
Sorbus alnifolia

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Family: Rosaceae (ro-ZAY-see-ee) (Info)
Genus: Sorbus (sor-bus) (Info)
Species: alnifolia (al-nee-FOH-lee-uh) (Info)

One vendor has this plant for sale.

2 members have or want this plant for trade.

Category:
Trees

Height:
over 40 ft. (12 m)

Spacing:
30-40 ft. (9-12 m)

Hardiness:
USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Sun to Partial Shade

Danger:
N/A

Bloom Color:
White/Near White

Bloom Time:
Mid Spring
Late Spring/Early Summer

Foliage:
Grown for foliage
Deciduous
Smooth-Textured

Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Non-patented

Propagation Methods:
From softwood cuttings
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
By grafting
By budding

Seed Collecting:
Allow unblemished fruit to ripen; clean and dry seeds

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There are a total of 8 photos.
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Profile:

3 positives
No neutrals
1 negative

Gardeners' Notes:

RatingAuthorContent
Positive coriaceous On Mar 18, 2014, coriaceous from ROSLINDALE, MA wrote:

There's a beautiful mature specimen in the Arnold Arboretum, Boston, MA Z6a that never shows any problems. Excellent form, grows large (to 50'). A beautiful 4-season shade tree.

Showy white May flowers, though in mature trees they're up high in the canopy. Gold to scarlet fall color can be outstanding. Showy scarlet fruit holds late into the winter, till the birds take them, and beautiful silvery beech-like bark.

Most mountainashes are small, short-lived trees, but this species is resistant to borer, lives much longer, and grows much larger than the others here in eastern Massachusetts.

This species is one of the Elizabeth Cary Miller Botanical Garden's Great Plant Picks, designed to promote the best plants for gardens of the maritime Pacific Northwest.

No mountainash tolerates hot summers or flourishes in eastern North America south of Z7.

Negative Zipity11 On Mar 18, 2014, Zipity11 from Brentwood, NH wrote:

Very invasive. We cut down the 44 trees in our Alle.

Positive NancyMcD On Oct 19, 2011, NancyMcD from Grand Marais, MI wrote:

This fine tree has done well for us here on the south shore of Lake Superior. It is rather slow-growing, like all mountain ashes (perhaps ten feet in ten years). The foliage is handsome in three seasons. You do need to protect it from deer in winter until it's tall enough to manage on its own. We pound in steel fenceposts and wrap snow fencing around it each fall and remove them in the spring. The tree is well worth the effort.

Positive Malus2006 On Mar 2, 2008, Malus2006 from Coon Rapids, MN (Zone 4a) wrote:

This is a underused species that is offered rarely in the plant trade. For the most part, it look like any other Mountain ash. The difference is into its leaves which look like Beech! The famous plant author, Michael Dirr said that this is the best of the Mountain Ash Species!

Regional...

This plant has been said to grow in the following regions:

Inniswold, Louisiana
Buckfield, Maine
Roslindale, Massachusetts
Grand Marais, Michigan
Minneapolis, Minnesota
Lee, New Hampshire
Blue Ash, Ohio
Nellysford, Virginia



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