Zone 3 · Japanese Spirea
Planting Japanese Spirea in Zone 3
Spiraea japonica
✅ Japanese Spirea thrives in zone 3 (hardy 3–8)
Can I plant today?
⏳ Too early to direct-sow
Last frost is in 4 weeks. Wait until soil warms.
Evaluated for April 27, 2026 ·
Zone's last frost
around May 15
Zone's first frost
around September 15
Bloom window
June – August
Peak bloom
July
Sun required
full sun
Mature height
36"
Spacing
36" apart
Type
perennial
How to plant Japanese Spirea in zone 3
Plant in spring. Prune in late winter; shear off spent blooms for rebloom.
Pair with these for continuous bloom
Japanese Spirea peaks in July. These companions keep your bed in color before and after.
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