Koreanspice Viburnum
Beginning of floweringViburnum carlesii
Adoxaceae, Caprifoliaceae · broadleaf deciduous shrub · introduced
Last updated
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.
Plant Profile
Size & Form
Site Requirements
Ornamental Interest
Active Conidial Spread
Larval Hatching & Feeding
Adult Emergence & Foliar Feeding
Diseases: Regionally Documented (7)
Pests: Regionally Documented (3)
Phenological Calendar
As of June 3, 2026, Puget Sound stations range from 2435.5 to 2672.8 GDD₃₂. Koreanspice Viburnum has passed beginning of flowering (876 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 | Beginning of flowering | — | — |
| Kent / Auburn | 2,665 | Beginning of flowering | — | — |
| Seattle / UW | 2,610 | Beginning of flowering | — | — |
| Olympia / Tumwater | 2,570 | Beginning of flowering | — | — |
| Tacoma / Puyallup | 2,535 | Beginning of flowering | — | — |
| Bellingham / Whatcom | 2,533 | Beginning of flowering | — | — |
| Sequim / Rain Shadow | 2,436 | Beginning of flowering | — | — |
View full calendar (1 stages)
| 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 Jun 3, 2026. Predicted dates use 16-day weather forecast through Jun 19, 2026, then climate normals.