Crataegus crus
Leaf emergenceCrataegus crus
Rosaceae · broadleaf deciduous tree · introduced
Last updated
Plant Profile
Size & Form
Height
32 ft
Spread
32 ft
Growth Rate
Medium
Site Requirements
Light
Sun to Part Shade
Soil Drainage
Wet Tolerant
Soil pH
4.5-8.5
Water
High
Hardiness
Zones 4a–7b
Ornamental Interest
Origin
North America
Field Observations
Cockspur Hawthorn: New leaves
Thornless Cockspur Hawthorn: Bud swell
March 22, 2026 · Kent
Watch for this season
Fire BlightHigh
Bloom Infection Window
Powdery MildewHigh
Active Conidial Spread
RustHigh
Uredinial Stage (Summer)
Adult Flight
+ 3 more — see full disease and pest lists below
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
Phenological Calendar
As of June 3, 2026, Puget Sound stations range from 2435.5 to 2672.8 GDD₃₂. Crataegus crus has passed leaf emergence (1539 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Jun 3, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 2,673 | Leaf emergence | — | — |
| Kent / Auburn | 2,665 | Leaf emergence | — | — |
| Seattle / UW | 2,610 | Leaf emergence | — | — |
| Olympia / Tumwater | 2,570 | Leaf emergence | — | — |
| Tacoma / Puyallup | 2,535 | Leaf emergence | — | — |
| Bellingham / Whatcom | 2,533 | Leaf emergence | — | — |
| Sequim / Rain Shadow | 2,436 | Leaf emergence | — | — |
View full calendar (1 stages)
| Stage | GDD32 | Typical Window |
|---|---|---|
| ● Leaf emergence BBCH 11 NOW | 1539 Observed | — |
Source: Field observation, Kent area, 2026-04-23 About GDD₃₂ →
Season tracker for Kent / Auburn as of Jun 3, 2026. Predicted dates use 16-day weather forecast through Jun 19, 2026, then climate normals.
Cultivars (1)
'Galli'
Common name: Cockspur Hawthorn; Mature height: 20–30 ft
Hardy to USDA Zone 4
Data Maturity Structured Multiple sources. Expert review underway.