Russian Hawthorn

Crataegus ambigua

Rosaceae · broadleaf deciduous tree · introduced

Last updated March 8, 2026

Data Coverage 2 of 6 dimensions

Site Data

Threats

Cultivars

Phenology

GDD Thresholds

Puget Sound

Quick Facts

Height

15–40 ft

Light

Full Sun

Hardiness

Zone Zones 5a–8b

Origin

southern Russia ambigua: uncertain, doubtful (an apparent

Diseases (6)

Venturia inaequalis Scab Thekopsora minima and Naohidemyces vaccinii Rust Symptom category — not a single disease Leaf Spot Erwinia amylovora Fire Blight Symptom category — not a single disease Canker Podosphaera aphanis var. aphanis Powdery Mildew

Pests (12)

Tetranychidae Spider mite Coccoidea Scale insect Caliroa cerasi Pear slug Dysaphis crataegi Hawthorn aphid Choreutis pariana Apple-and-thorn skeletonizer Acanthococcus azaleae Azalea bark scale Enarmonia formosana Cherry bark tortrix Hyphantria cunea Fall webworm Tortricidae Leafroller Pear sawfly (pear slug) Malacosoma spp. Tent caterpillar Pear sawfly