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Sorbus scopulina (Greene's mountain ash)
Loughmiller, Campbell and Lynn

Sorbus scopulina

Sorbus scopulina Greene

Greene's Mountain Ash, Cascade Mountain-ash, Western Mountain-ash

Rosaceae (Rose Family)


USDA Symbol: SOSC2

USDA Native Status: L48 (N), AK (N), CAN (N)

Cascade mountain-ash is a shrub or shrub-like tree with several erect stems usually 3-12 ft. Bark is reddish. Deciduous leaves are pinnately compound with 11-15 shiny, oblong leaflets. Small, white flowers occur in large terminal clusters and are followed by persistent, red-orange berries. A shrub forming dense clumps, or rarely a small tree, with many small white flowers and small, applelike fruit.

This shrubby species takes the form of a small tree in southeastern Alaska. The common name honors Edward Lee Greene (1843-1915), the United States botanist who prepared the description. Birds and mammals eat the fruit.


From the Image Gallery

15 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Shrub
Leaf Retention: Deciduous
Fruit Type: Pome
Size Notes: Up to about 25 feet tall, often shorter.
Leaf: Green
Autumn Foliage: yes

Bloom Information

Bloom Color: White
Bloom Time: Mar , Apr , May , Jun


USA: AK , CA , CO , ID , MT , ND , NM , NV , OR , SD , UT , WA , WY
Canada: AB , BC
Native Distribution: W. Alt. to AK, s. to NM, UT & Tulare Co., CA; also Black Hills
Native Habitat: Canyons; wooded slopes; stream banks; 4000-9000 ft.

Growing Conditions

Water Use: Medium
Light Requirement: Sun , Part Shade , Shade
Soil Moisture: Moist
CaCO3 Tolerance: Low
Soil Description: Rich soils.


Use Wildlife: Grouse, cedar waxwings, and grosbeaks consume the berries.
Conspicuous Flowers: yes
Fragrant Flowers: yes

Find Seed or Plants

Find seed sources for this species at the Native Seed Network.

View propagation protocol from Native Plants Network.

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Native Seed Network - Corvallis, OR


Bibref 841 - Native Alternatives to Invasive Plants (2006) Burrell, C. C.

Search More Titles in Bibliography

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.

Additional resources

USDA: Find Sorbus scopulina in USDA Plants
FNA: Find Sorbus scopulina in the Flora of North America (if available)
Google: Search Google for Sorbus scopulina


Record Modified: 2022-10-11
Research By: TWC Staff

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