Quince
'Flower buds visible'Cydonia oblonga
Rosaceae · broadleaf deciduous tree · introduced
Last updated
Quick Facts
Height
15 ft
Spread
23 ft
Growth Rate
Slow
Light
Full Sun
Soil
Well Drained
Water
Moderate
Hardiness
Zone Zones 5a–8b
Bloom Time
April to May
Origin
Iran and Turkestan
Watch for this season
Fire BlightHigh
Bloom Infection Window
RustHigh
Aecial Stage (Alternate Host)
Cherry bark tortrixModerate
Spring Feeding & Pupation
Phenological Calendar
As of May 13, 2026, Puget Sound stations range from 1906.2 to 2098.2 GDD₃₂. Quince has passed 'flower buds visible' (1072 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of May 13, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 2,098 | 'Flower buds visible' | — | — |
| Kent / Auburn | 2,089 | 'Flower buds visible' | — | — |
| Seattle / UW | 2,063 | 'Flower buds visible' | — | — |
| Olympia / Tumwater | 2,025 | 'Flower buds visible' | — | — |
| Tacoma / Puyallup | 1,993 | 'Flower buds visible' | — | — |
| Bellingham / Whatcom | 1,972 | 'Flower buds visible' | — | — |
| Sequim / Rain Shadow | 1,906 | 'Flower buds visible' | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| 'Bud break' BBCH '07' | 912 | '' |
| 'Leaf emergence' BBCH '11' | 912 | '' |
| ● 'Flower buds visible' BBCH '51' NOW | 1072 | '' |
Source: 'NPN citizen science observations (WA+OR), n=9, median. services.usanpn.org' About GDD₃₂ →
Season tracker for Kent / Auburn as of May 13, 2026. Predicted dates use 16-day weather forecast through May 29, 2026, then climate normals.
Diseases: Regionally Documented (4)
Pests: Regionally Documented (1)
Data Maturity Structured Multiple sources. Expert review underway.