Sorbus sitchensis M. Roem.
Sitka mountain-ash, Western mountain ash
Rosaceae (Rose Family)
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).
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Plant CharacteristicsDuration: Perennial
Autumn Foliage: yes
Size Class: 6-12 ft.
Bloom InformationBloom Color: White
Bloom Time: Jun , Jul
DistributionUSA: AK , CA , ID , MT , OR , WA
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
Find Seed or Plants
Find seed sources for this species at the Native Seed Network.
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Native Seed Network - Corvallis, OR
BibliographyBibref 841 - Native Alternatives to Invasive Plants (2006) Burrell, C. C.
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Additional resourcesUSDA: Find Sorbus sitchensis in USDA Plants
FNA: Find Sorbus sitchensis in the Flora of North America (if available)
Google: Search Google for Sorbus sitchensis
MetadataRecord Modified: 2007-01-01
Research By: TWC Staff