Manchu Cherry

Prunus tomentosa

Rosaceae · [VERIFY] · [VERIFY]

Last updated March 16, 2026

Data Coverage 3 of 6 dimensions

Site Data

Threats

Cultivars

Phenology

GDD Thresholds

Regional Notes

Quick Facts

Light

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Soil

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Water

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Hardiness

Zone Zone [VERIFY]

Origin

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Phenological Calendar

Regional Season Tracker

GDD₃₂ accumulation across 6 Puget Sound stations · as of Mar 14, 2026

Station	GDD₃₂	Current Stage	Next	To Go
Seattle / UW	885	Beginning of flowering	Full bloom	14
Olympia / Tumwater	816	Beginning of flowering	Full bloom	83
Bellingham / Whatcom	816	Beginning of flowering	Full bloom	83
Kent / Auburn	805	Beginning of flowering	Full bloom	94
Sequim / Rain Shadow	798	Beginning of flowering	Full bloom	101
Tacoma / Puyallup	792	Beginning of flowering	Full bloom	107

Stage	GDD₃₂	Typical Window	What to Look For
● Beginning of flowering BBCH 61 NOW	679	—	First open blossoms visible on early branches
○ Full bloom BBCH 65 NEXT	899	— est. Mar 20 (forecast)	Crown in full flower; heavy pollinator activity

GDD = Growing Degree Days (base 32°F, Jan 1 start). Thresholds calibrated for Western WA maritime climate from field observation and PNW bloom timing estimates. Season tracker for Kent / Auburn as of Mar 14, 2026. Predicted dates use 16-day weather forecast through Mar 31, 2026, then climate normals.