Apple Serviceberry
Amelanchier x grandiflora
Rosaceae · [VERIFY] · native
Last updated
Upright deciduous shrub or small tree, 12 to 25 feet tall, with bronze emerging foliage maturing to glossy green and white flower clusters in spring. Dark blue berries follow flowering; leaves turn orange-red in fall.
Ornamental hybrid combining vigor with showy seasonality; prefers moist, well-drained soil and sun to part shade. Hardy and adaptable with minimal pest pressure. Excellent for screening, multi-season interest, and songbird habitat.
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 | Beginning of flowering | — | — |
| Seattle / UW | 1,112 | Beginning of flowering | — | — |
| Olympia / Tumwater | 1,049 | Beginning of flowering | — | — |
| Kent / Auburn | 1,048 | Beginning of flowering | — | — |
| Bellingham / Whatcom | 1,041 | Beginning of flowering | — | — |
| Tacoma / Puyallup | 1,017 | Beginning of flowering | — | — |
| Sequim / Rain Shadow | 1,012 | Beginning of flowering | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| Beginning of flowering BBCH 61 | 980 | — |
| ● Full bloom BBCH 65 NOW | 941 | — |
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.