Crimsoneyed rosemallow
Hibiscus moscheutos
Malvaceae · [VERIFY] · native
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
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Mar 30, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 1,116 | Pre-season | Beginning of flowering | 5,783 |
| Seattle / UW | 1,112 | Pre-season | Beginning of flowering | 5,787 |
| Olympia / Tumwater | 1,049 | Pre-season | Beginning of flowering | 5,851 |
| Kent / Auburn | 1,048 | Pre-season | Beginning of flowering | 5,851 |
| Bellingham / Whatcom | 1,041 | Pre-season | Beginning of flowering | 5,858 |
| Tacoma / Puyallup | 1,017 | Pre-season | Beginning of flowering | 5,882 |
| Sequim / Rain Shadow | 1,012 | Pre-season | Beginning of flowering | 5,887 |
| Stage | GDD32 | Typical Window |
|---|---|---|
| ○ Beginning of flowering BBCH 61 NEXT | 6899 | — |
| Full bloom BBCH 65 | 7571 | — |
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 Mar 30, 2026. Predicted dates use 16-day weather forecast through Apr 15, 2026, then climate normals.