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Western Mountain Ash (Grayi)

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Western Mountain Ash (Grayi)

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The Western Mountain Ash (Grayi) is generally described as a perennial tree or shrub. This is native to the U.S. (United States) has its most active growth period in the spring and summer . The Western Mountain Ash (Grayi) has dark green foliage and inconspicuous white flowers, with an abuncance of conspicuous red fruits or seeds. The greatest bloom is usually observed in the late spring, with fruit and seed production starting in the summer and continuing until fall. Leaves are not retained year to year. The Western Mountain Ash (Grayi) has a moderate life span relative to most other plant species and a slow growth rate. At maturity, the typical Western Mountain Ash (Grayi) will reach up to 15 feet high, with a maximum height at 20 years of 15 feet.

The Western Mountain Ash (Grayi) is usually not commercially available except under contract. It can be propagated by bare root, container, seed. It has a moderate ability to spread through seed production and the seedlings have high vigor. Note that cold stratification is not required for seed germination and the plant cannot survive exposure to temperatures below -28°F. has low tolerance to drought and restricted water conditions.

Plant Basics
Category
Growth Rate Slow
General Type Tree, Shrub
Growth Period Spring, Summer
Growth Duration Perennial
Lifespan Moderate
Plant Nativity Native to U.S.
Commercial Availability Contracting Only
Physical Characteristics
Bloom Period Late Spring
Displays Fall Colors Yes
Shape/Growth Form Single Stem
Drought Tolerance Low
Shade Tolerance Intolerant
Height When Mature 15
Vegetative Spread Moderate
Flower Color White
Flower Conspicuousness Yes
Fruit/Seed Abundance High
Fruit/Seed Seasonality Summer Fall
Seed Spread Rate Moderate
Gardening Characteristics
Propagations (Ways to Grow) Bare Root, Container, Seed
Moisture Requirements Medium
Cold Stratification Required Yes
Minimum Temperature -28
Soil Depth for Roots 16
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Resprout Ability Yes
Responds to Coppicing Yes
Growth Requirements
pH Range 6–7.2 pH
Precipitation Range 20–20 inches/yr
Planting Density 700–1700 indiv./acre
Soil Textures Coarse, Fine, Medium
Soil Depth for Roots 16
Minimum Frost-Free Days 100 day(s)
Salinity Tolerance None
CaCO3 Tolerance None
Sustainability & Use
Leaf Retention No
Palatability Low
Fire Resistant No
Causes Livestock Bloating None

Source: USDA, NRCS, PLANTS Database, plants.usda.gov.
National Plant Data Center, Baton Rouge, LA 70874-4490 USA

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Plant Name Synonyms
  • Sorbus occidentalis
  • Sorbus sitchensis ssp. grayi
Plant Distribution
can be found in Alaska, California, Oregon, Washington