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Sorbus sitchensis M. Roem.
Sitka mountain-ash, Western mountain ash
USDA Symbol: sosi2
A 3-10 ft. shrub with many erect to spreading stems from a common base. Foliage is pinnately compound with 7-9 toothed leaflets. Flowers are small and white in dense, flat-topped clusters. They are followed by huge clusters of big, reddish-orange, persistent berries. Fall foliage is yellow to bronzy-red.
The Sitka Mountain Ash is a member of the family Rosaceae which includes about 2000 species of trees, shrubs, and herbs worldwide; approximately 77 native and 9 naturalized tree species and many species of shrubs and herbs in North America; including service-berries (Amelanchier), hawthorns (Crataegus), apples (Malus), plums and cherries (Prunus), and mountain-ashes (Sorbus).
Plant CharacteristicsDuration: Perennial Habit: Shrub Autumn Foliage:
Red Size Class:
Bloom InformationBloom Color: White
Bloom Time: Jun , Jul
, WA Canada: BC Native Distribution: AK
& Yukon, s. through mts. to n. CA,
e. to e. B.C., n. ID
& n.w. MT Native Habitat:
Wooded or open, upper montane to subalpine slopes
Growing ConditionsLight Requirement: Sun , Part Shade , Shade
Soil Moisture: Moist
Soil Description: Moist to drier, well-drained soil.
Conditions Comments: Not Available
BenefitUse Wildlife: Grouse, cedar waxwings & grosbeaks consume the berries.
PropagationDescription: Usually propagated by seed sown fresh in fall or stored and stratified.
Seed Collection: Not Available
Seed Treatment: Cold stratify at 32 degrees for 2-4 months.
Commercially Avail: yes
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 either on display or available from the following:
Native Seed Network
- Corvallis, OR
Record Last Modified: 2007-01-01
Research By: TWC Staff