Greene Mountain Ash

Sorbus scopulina

Rosaceae · broadleaf deciduous shrub · native

Last updated

Greene mountain ash, also called western mountain ash, is a small to medium deciduous tree native to the Rocky Mountains and Great Basin regions of western North America. Growing 20-30 feet tall, it produces pinnate leaves, white flowers in flat clusters, and orange to red berries.

This species thrives in cool climates with well-drained soil in full sun to light shade and is extremely cold-hardy to zones 2-6. The berries are consumed by birds and wildlife; the plant is useful in native plant landscapes and provides food and nesting habitat.

Quick Facts

Height
15 ft
Hardiness
Zone Zones 2a–8b
Origin
Pacific Northwest native
Watch for this season

Spring Canker Activation

Bloom Infection Window

Spore Release (Fall & Spring Rains)

RustHigh

Aecial Stage (Alternate Host)

+ 4 more — see full disease and pest lists below

Diseases: Regionally Documented (5)

Pests: Regionally Documented (9)

Data Maturity
Structured Multiple sources. Expert review underway.