Garland Spirea

Spiraea arguta

Rosaceae · broadleaf deciduous shrub · introduced

Last updated

Quick Facts

Height
5–6 ft
Light
Full Sun to Shade
Hardiness
Zones 4a–8b

Phenological Calendar

As of May 24, 2026, Puget Sound stations range from 2172.5 to 2394 GDD₃₂. Garland Spirea has passed 'first bloom' (1391 GDD₃₂).

Regional Season Tracker

GDD₃₂ accumulation across 7 Puget Sound stations · as of May 24, 2026
Station GDD₃₂ Current Stage Next To Go
Issaquah / East King 2,394 'First bloom'
Kent / Auburn 2,373 'First bloom'
Seattle / UW 2,332 'First bloom'
Olympia / Tumwater 2,295 'First bloom'
Tacoma / Puyallup 2,259 'First bloom'
Bellingham / Whatcom 2,256 'First bloom'
Sequim / Rain Shadow 2,173 'First bloom'
View full calendar (2 stages)
Stage GDD32 Typical Window
'Full bloom' BBCH '65' 923 ''
'First bloom' BBCH '61' NOW 1391 ''

Source: 'Master catalog (OSU, UMD), GDD50 base' About GDD₃₂ →

Season tracker for Kent / Auburn as of May 24, 2026. Predicted dates use 16-day weather forecast through Jun 9, 2026, then climate normals.

Data Maturity
Baseline Extension data. Expert review underway.