Shadblow
Amelanchier canadensis
Rosaceae · broadleaf deciduous shrub · native
Last updated
Data Maturity Baseline
This profile contains verified botanical data. Regional field notes and expert review are in progress.
Quick Facts
Height
15 ft
Spread
9 ft
Growth Rate
Moderate
Light
Sun to Part Shade
Soil
Wet Tolerant
Water
Moderate
Hardiness
Zone Zones 3a–8b
Bloom Time
April to May
Fall Color
Gold, orange, red, yellow
Origin
from Maine to Georgia, Louisiana and west to Iowa and
Phenological Calendar
As of April 23, 2026, Puget Sound stations range from 1434.4 to 1592.7 GDD₃₂. Shadblow has passed 'first bloom' (798 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Apr 23, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 1,593 | 'First bloom' | — | — |
| Seattle / UW | 1,554 | 'First bloom' | — | — |
| Kent / Auburn | 1,537 | 'First bloom' | — | — |
| Olympia / Tumwater | 1,505 | 'First bloom' | — | — |
| Bellingham / Whatcom | 1,483 | 'First bloom' | — | — |
| Tacoma / Puyallup | 1,472 | 'First bloom' | — | — |
| Sequim / Rain Shadow | 1,434 | 'First bloom' | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| ● 'First bloom' BBCH '61' NOW | 798 | '' |
Range: 550–706 GDD₃₂
(6yr)
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 23, 2026. Predicted dates use 16-day weather forecast through May 10, 2026, then climate normals.