Crataegus crus
Leaf emergenceCrataegus crus
Rosaceae · broadleaf deciduous tree · introduced
Last updated
Data Maturity Structured Multiple sources. Expert review underway.
Watch for this season
Fire BlightHigh
Bloom Infection Window
RustHigh
Aecial Stage (Alternate Host)
Scale insectHigh
Crawler Emergence
Tent caterpillarHigh
Larval Feeding
+ 3 more — see full disease and pest lists below
Field Observations
Field Observation
Crataegus crus-galli var. inermis · Cockspur Hawthorn
new leaves
Field Observation
Crataegus crus-galli var. inermis · Thornless Cockspur Hawthorn
bud swell
March 22, 2026 · Kent · 930 GDD₃₂ · BBCH 01
Quick Facts
Height
32 ft
Spread
32 ft
Growth Rate
Medium
Light
Sun to Part Shade
Soil
Wet Tolerant
Water
High
Hardiness
Zone Zones 4a–7b
Phenological Calendar
As of May 9, 2026, Puget Sound stations range from 1800.9 to 1983.6 GDD₃₂. Crataegus crus has passed leaf emergence (1539 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of May 9, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 1,984 | Leaf emergence | — | — |
| Kent / Auburn | 1,972 | Leaf emergence | — | — |
| Seattle / UW | 1,954 | Leaf emergence | — | — |
| Olympia / Tumwater | 1,913 | Leaf emergence | — | — |
| Tacoma / Puyallup | 1,881 | Leaf emergence | — | — |
| Bellingham / Whatcom | 1,863 | Leaf emergence | — | — |
| Sequim / Rain Shadow | 1,801 | Leaf emergence | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| ● Leaf emergence BBCH 11 NOW | 1539 | — |
Source: Field observation, Kent area, 2026-04-23 About GDD₃₂ →
Season tracker for Kent / Auburn as of May 9, 2026. Predicted dates use 16-day weather forecast through May 26, 2026, then climate normals.
Diseases — Regionally Documented (6)
Venturia spp. — multiple host-specific species: V Scab Multiple genera (Melampsoridium, Thekopsora, Naohidemyces... Rust Symptom category — not a single disease Leaf Spot Erwinia amylovora Fire Blight Symptom category — not a single disease Canker Multiple obligate biotrophic fungi (Erysiphales: Erysipha... Powdery Mildew
Pests — Regionally Documented (10)
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 Malacosoma spp. Tent caterpillar
Cultivars (1)
'Galli'
Common name: Cockspur Hawthorn; Mature height: 20–30 ft
Hardy to USDA Zone 4