Possumhaw Smooth Witherod Northern Wild Raisin
Viburnum nudum
Adoxaceae, Caprifoliaceae · broadleaf deciduous shrub · native
Last updated
Data Coverage 5 of 6 dimensions
Quick Facts
Height
10 ft
Light
Full Sun to Part Shade
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
Phenological Calendar
As of April 3, 2026, Puget Sound stations range from 1070 to 1180.6 GDD₃₂. Possumhaw Smooth Witherod Northern Wild Raisin typically reaches 'full bloom' at 3095 GDD₃₂, predicted around Jun 26.
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Apr 3, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 1,181 | Pre-season | 'Full bloom' | 1,914 |
| Seattle / UW | 1,171 | Pre-season | 'Full bloom' | 1,924 |
| Kent / Auburn | 1,111 | Pre-season | 'Full bloom' | 1,984 |
| Olympia / Tumwater | 1,106 | Pre-season | 'Full bloom' | 1,989 |
| Bellingham / Whatcom | 1,101 | Pre-season | 'Full bloom' | 1,994 |
| Tacoma / Puyallup | 1,075 | Pre-season | 'Full bloom' | 2,020 |
| Sequim / Rain Shadow | 1,070 | Pre-season | 'Full bloom' | 2,025 |
| Stage | GDD32 | Typical Window |
|---|---|---|
| ○ 'Full bloom' BBCH '65' NEXT | 3095 | '' est. Jun 26 (avg) |
Range: 2244–2602 GDD₃₂
(6yr)
GDD = Growing Degree Days (base 32°F, Jan 1 start). Why base 32? Source GDD₅₀ thresholds from Herms 2004 (OSU, Secrest Arboretum, Ohio) and UMD IPMnet (Gill & Klick, mid-Atlantic), converted to GDD₃₂ via Kent bloom-date mapping. Season tracker for Kent / Auburn as of Apr 3, 2026. Predicted dates use 16-day weather forecast through Apr 19, 2026, then climate normals.
Diseases (10)
Symptom category — not a single disease Leaf Spot Botrytis cinerea Botrytis Shoot Blight Phytophthora ramorum Ramorum leaf and shoot blight (Sudden oak death) Podosphaera aphanis var. aphanis Powdery Mildew Pseudomonas syringae pv. viburni or Xanthomonas spp. Bacterial blight (Leaf spot) Pseudomonas syringae pv. syringae Bacterial Blight Phytophthora ramorum"filthy five\" genera are inc Ramorum Leaf Blight and Shoot Dieback Symptom category — not a single disease Root Rot Phytophthora cactorum"heeled in\" (placed in sawdust pile... Shoot Blight Botryosphaeria corticis Stem Canker
Pests (3)
Cultivars (1)
'Winterthur'
Common name: Winterthur Smooth Witherod; Mature height: 6 ft
Hardy to USDA Zone 5