Crimsoneyed rosemallow
Hibiscus moscheutos
Malvaceae · [VERIFY] · introduced
Last updated
Vigorous, shrubby, woody-based perennial to 3 to 7 feet with showy, dinner plate-sized hollyhock-like flowers (4 to 6 inches diameter) in white, pink, or cream with reddish-purple to dark crimson centers.
Rapid growth requires full sun and moist, organically rich soils; deep watering is essential during establishment. Tolerates heat and humidity; suited to moist borders, wet areas, stream and pond margins, and large containers.
Quick Facts
Phenological Calendar
As of May 24, 2026, Puget Sound stations range from 2172.5 to 2394 GDD₃₂. Crimsoneyed rosemallow typically reaches beginning of flowering at 6899 GDD₃₂, predicted around Oct 30.
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of May 24, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 2,394 | Pre-season | Beginning of flowering | 4,505 |
| Kent / Auburn | 2,373 | Pre-season | Beginning of flowering | 4,526 |
| Seattle / UW | 2,332 | Pre-season | Beginning of flowering | 4,567 |
| Olympia / Tumwater | 2,295 | Pre-season | Beginning of flowering | 4,604 |
| Tacoma / Puyallup | 2,259 | Pre-season | Beginning of flowering | 4,640 |
| Bellingham / Whatcom | 2,256 | Pre-season | Beginning of flowering | 4,644 |
| Sequim / Rain Shadow | 2,173 | Pre-season | Beginning of flowering | 4,727 |
View full calendar (2 stages)
| Stage | GDD32 | Typical Window |
|---|---|---|
| ○ Beginning of flowering BBCH 61 NEXT | 6899 | — est. Oct 30 (avg) |
| Full bloom BBCH 65 | 7571 | — |
Source: UMD phenology catalog (UMD: extension.umd.edu) About GDD₃₂ →
Season tracker for Kent / Auburn as of May 24, 2026. Predicted dates use 16-day weather forecast through Jun 9, 2026, then climate normals.