Possumhaw Smooth Witherod Northern Wild Raisin
Viburnum nudum
Adoxaceae, Caprifoliaceae · broadleaf deciduous shrub · native
Last updated
Quick Facts
Height
10 ft
Growth Rate
Medium
Light
Full Sun to Part Shade
Soil
Well Drained
Water
Moderate
Hardiness
Zone Zones 5a–8b
Bloom Time
May to June
Fall Color
Red, scarlet
Origin
the Eastern Canada, and from New York south to Florida and
Watch for this season
Powdery MildewModerate
Spring Emergence / Primary Infection
Root weevilModerate
Adult Emergence & Foliar Feeding
Phenological Calendar
As of May 14, 2026, Puget Sound stations range from 1926.1 to 2121.1 GDD₃₂. Possumhaw Smooth Witherod Northern Wild Raisin typically reaches 'full bloom' at 3095 GDD₃₂, predicted around Jun 21.
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of May 14, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 2,121 | Pre-season | 'Full bloom' | 974 |
| Kent / Auburn | 2,113 | Pre-season | 'Full bloom' | 982 |
| Seattle / UW | 2,085 | Pre-season | 'Full bloom' | 1,010 |
| Olympia / Tumwater | 2,047 | Pre-season | 'Full bloom' | 1,048 |
| Tacoma / Puyallup | 2,016 | Pre-season | 'Full bloom' | 1,079 |
| Bellingham / Whatcom | 1,994 | Pre-season | 'Full bloom' | 1,101 |
| Sequim / Rain Shadow | 1,926 | Pre-season | 'Full bloom' | 1,169 |
| Stage | GDD32 | Typical Window |
|---|---|---|
| ○ 'Full bloom' BBCH '65' NEXT | 3095 | '' est. Jun 21 (avg) |
Range: 2244–2602 GDD₃₂
(6yr)
Source: 'Master catalog (UMD), converted GDD50->GDD32 via Kent bloom-date mapping' About GDD₃₂ →
Season tracker for Kent / Auburn as of May 14, 2026. Predicted dates use 16-day weather forecast through May 30, 2026, then climate normals.
Diseases: Regionally Documented (7)
Pests: Regionally Documented (3)
Cultivars (1)
'Winterthur'
Common name: Winterthur Smooth Witherod; Mature height: 6 ft
Hardy to USDA Zone 5
Data Maturity Structured Multiple sources. Expert review underway.