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.

Plant Profile

Size & Form

Height
15 ft
Spread
5-10 ft
Growth Rate
Slow

Site Requirements

Light
Full Sun
Soil Drainage
Adaptable
Soil pH
4.5-7.5 (strongly acidic to slightly alkaline)
Water
High
Drought Tolerance
Low
Hardiness
Zones 2a–8b

Ornamental Interest

Bloom Time
summer
Fall Color
Yes
Origin
Pacific Northwest native
Watch for this season

Peak Spore Production and Dispersal

Bloom Infection Window

RustHigh

Uredinial Stage (Summer)

AphidHigh

Peak Population & Dispersal

+ 2 more — see full disease and pest lists below

Diseases: Regionally Documented (5)

Pests: Regionally Documented (9)

Data Maturity
Structured Multiple sources. Expert review underway.