Whitebeam Mountain Ash

Sorbus aria

Rosaceae · broadleaf deciduous tree · introduced

Last updated March 9, 2026

Data Coverage 2 of 6 dimensions

Site Data

Threats

Cultivars

Phenology

GDD Thresholds

Puget Sound

Quick Facts

Height

35–45 ft

Spread

26 ft

Growth Rate

Medium

Light

Full Sun

Soil

Moist

Water

Moderate

Hardiness

Zone Zones 5a–8b

Origin

Europe, long cultivated

Diseases (5)

Cytospora canker Cytospora Canker Erwinia amylovora Fire Blight Symptom category — not a single disease Leaf Spot Neonectria ditissima Nectria Canker Thekopsora minima and Naohidemyces vaccinii Rust

Pests (10)

Aphidoidea Aphid Choreutis pariana Apple-and-thorn skeletonizer Enarmonia formosana Cherry bark tortrix Pristiphora geniculata Mountain ash sawfly Pear sawfly (pear slug) Phytoptus pyri Pearleaf blister mite Otiorhynchus spp. Root weevil Malacosoma spp. Tent caterpillar Leaf blister mite Ash borer