Nantucket serviceberry
Amelanchier nantucketensis
Rosaceae · [VERIFY] · native
Last updated
Compact, rhizomatous shrub growing 4 to 5 feet tall with narrow, fine-textured leaves and clusters of white flowers in spring. Produces blue-black berries; naturally forms dense mounding to spreading form.
Extremely drought tolerant once established, thriving in sandy, well-drained soils and full sun. Suited to tough sites, native plant gardens, and bird borders. Spreading growth habit makes it useful for erosion control.
Quick Facts
Phenological Calendar
As of April 19, 2026, Puget Sound stations range from 1342.9 to 1500.8 GDD₃₂. Nantucket serviceberry has passed full bloom (992 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Apr 19, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 1,501 | Full bloom | — | — |
| Seattle / UW | 1,465 | Full bloom | — | — |
| Kent / Auburn | 1,441 | Full bloom | — | — |
| Olympia / Tumwater | 1,415 | Full bloom | — | — |
| Bellingham / Whatcom | 1,390 | Full bloom | — | — |
| Tacoma / Puyallup | 1,381 | Full bloom | — | — |
| Sequim / Rain Shadow | 1,343 | Full bloom | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| ● Full bloom BBCH 65 NOW | 992 | — |
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 Apr 19, 2026. Predicted dates use 16-day weather forecast through May 5, 2026, then climate normals.