Rhubarb
Rheum rhabarbarum
· perennial · introduced
Last updated
Plant Profile
Ornamental Interest
Origin
a region stretching from southern Siberia to north and
Diseases: Regionally Documented (4)
Phenological Calendar
As of June 3, 2026, Puget Sound stations range from 2435.5 to 2672.8 GDD₃₂. Rhubarb has passed 'flower buds visible' (1428 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 | 'Flower buds visible' | — | — |
| Kent / Auburn | 2,665 | 'Flower buds visible' | — | — |
| Seattle / UW | 2,610 | 'Flower buds visible' | — | — |
| Olympia / Tumwater | 2,570 | 'Flower buds visible' | — | — |
| Tacoma / Puyallup | 2,535 | 'Flower buds visible' | — | — |
| Bellingham / Whatcom | 2,533 | 'Flower buds visible' | — | — |
| Sequim / Rain Shadow | 2,436 | 'Flower buds visible' | — | — |
View full calendar (1 stages)
| Stage | GDD32 | Typical Window |
|---|---|---|
| ● 'Flower buds visible' BBCH '51' NOW | 1428 | '' |
Source: 'NPN citizen science observations (WA+OR), n=6, median. services.usanpn.org' 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.
Data Maturity Baseline Extension data. Expert review underway.