Koreanspice Viburnum
Beginning of floweringViburnum carlesii
Adoxaceae, Caprifoliaceae · broadleaf deciduous shrub · introduced
Last updated
Spring Emergence / Primary Infection
Koreanspice viburnum is a deciduous broadleaf shrub from Korea reaching 4-8 ft. It produces fragrant flowers (10-14 mm) that are pink in bud, opening white, in hemispherical clusters about 6 cm wide. Bloom time is March to April.
Koreanspice viburnum is hardy in zones 4-8 and prefers full sun to part shade. Prune immediately after flowering through early summer since flowers form on old wood. It tolerates black walnut and attracts birds with minimal maintenance.
Quick Facts
Phenological Calendar
As of May 9, 2026, Puget Sound stations range from 1800.9 to 1983.6 GDD₃₂. Koreanspice Viburnum has passed beginning of flowering (876 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 | Beginning of flowering | — | — |
| Kent / Auburn | 1,972 | Beginning of flowering | — | — |
| Seattle / UW | 1,954 | Beginning of flowering | — | — |
| Olympia / Tumwater | 1,913 | Beginning of flowering | — | — |
| Tacoma / Puyallup | 1,881 | Beginning of flowering | — | — |
| Bellingham / Whatcom | 1,863 | Beginning of flowering | — | — |
| Sequim / Rain Shadow | 1,801 | Beginning of flowering | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| ● Beginning of flowering BBCH 61 NOW | 876 | — |
Source: UMD: extension.umd.edu) 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.