Garland Spirea
Spiraea arguta
Rosaceae · broadleaf deciduous shrub · introduced
Last updated
Quick Facts
Height
5–6 ft
Light
Full Sun to Shade
Hardiness
Zones 4a–8b
Phenological Calendar
As of May 24, 2026, Puget Sound stations range from 2172.5 to 2394 GDD₃₂. Garland Spirea has passed 'first bloom' (1391 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of May 24, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 2,394 | 'First bloom' | — | — |
| Kent / Auburn | 2,373 | 'First bloom' | — | — |
| Seattle / UW | 2,332 | 'First bloom' | — | — |
| Olympia / Tumwater | 2,295 | 'First bloom' | — | — |
| Tacoma / Puyallup | 2,259 | 'First bloom' | — | — |
| Bellingham / Whatcom | 2,256 | 'First bloom' | — | — |
| Sequim / Rain Shadow | 2,173 | 'First bloom' | — | — |
View full calendar (2 stages)
| Stage | GDD32 | Typical Window |
|---|---|---|
| 'Full bloom' BBCH '65' | 923 | '' |
| ● 'First bloom' BBCH '61' NOW | 1391 | '' |
Source: 'Master catalog (OSU, UMD), GDD50 base' About GDD₃₂ →
Season tracker for Kent / Auburn as of May 24, 2026. Predicted dates use 16-day weather forecast through Jun 9, 2026, then climate normals.
Data Maturity Baseline Extension data. Expert review underway.