Compact Garland Spirea
Beginning of floweringSpiraea x arguta
Rosaceae · [VERIFY] · introduced
Last updated
Compact garland spirea is a hybrid deciduous shrub reaching 2-3 feet tall and wide, producing small, narrow leaves and abundant clusters of white flowers arranged along arching branches in spring. The plant has a fine-textured, spreading habit.
This hybrid is hardy to zones 4-9 and thrives in full sun to light shade with well-drained soil. It is fast-growing and responds well to pruning. The plant is valued for its early spring bloom and fine texture in borders and naturalized gardens.
Quick Facts
Phenological Calendar
As of May 19, 2026, Puget Sound stations range from 2045.5 to 2249.7 GDD₃₂. Compact Garland Spirea has passed beginning of flowering (1391 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of May 19, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 2,250 | Beginning of flowering | — | — |
| Kent / Auburn | 2,222 | Beginning of flowering | — | — |
| Seattle / UW | 2,189 | Beginning of flowering | — | — |
| Olympia / Tumwater | 2,151 | Beginning of flowering | — | — |
| Bellingham / Whatcom | 2,124 | Beginning of flowering | — | — |
| Tacoma / Puyallup | 2,117 | Beginning of flowering | — | — |
| Sequim / Rain Shadow | 2,046 | Beginning of flowering | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| Full bloom BBCH 65 | 1377 | — |
| ● Beginning of flowering BBCH 61 NOW | 1391 | — |
Source: UMD: extension.umd.edu) About GDD₃₂ →
Season tracker for Kent / Auburn as of May 19, 2026. Predicted dates use 16-day weather forecast through Jun 4, 2026, then climate normals.