Ash
Sorbaria sorbifolia
Rosaceae · broadleaf deciduous shrub · introduced
Last updated
Suitable for zones 2-7b; at the warm edge of its range in Zone 8b. The heavy clay soils of the Kent valley may naturally suppress aggressive suckering. NC State and MBG report no serious insect or disease problems. ‘Sem’ cultivar preferred for managed landscapes due to reduced suckering. Useful for erosion control on slopes.
Plant Profile
Size & Form
Site Requirements
Ornamental Interest
Field Observations
Active Conidial Spread
Diseases: Other Associations (1)
Pests: Other Associations (1)
Phenological Calendar
As of June 3, 2026, Puget Sound stations range from 2435.5 to 2672.8 GDD₃₂. Ash typically reaches 'first bloom' at 3276 GDD₃₂, predicted around Jun 26.
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 | Pre-season | 'First bloom' | 603 |
| Kent / Auburn | 2,665 | Pre-season | 'First bloom' | 611 |
| Seattle / UW | 2,610 | Pre-season | 'First bloom' | 666 |
| Olympia / Tumwater | 2,570 | Pre-season | 'First bloom' | 707 |
| Tacoma / Puyallup | 2,535 | Pre-season | 'First bloom' | 741 |
| Bellingham / Whatcom | 2,533 | Pre-season | 'First bloom' | 743 |
| Sequim / Rain Shadow | 2,436 | Pre-season | 'First bloom' | 841 |
View full calendar (2 stages)
| Stage | GDD32 | Typical Window |
|---|---|---|
| ○ 'First bloom' BBCH '61' NEXT | 3276 | '' est. Jun 26 (avg) |
| Leaf emergence BBCH 11 | — Observed | — |
Source: 'Master catalog (OSU), GDD50 base' 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.
