Zone 4 · Sweet Alyssum
Planting Sweet Alyssum in Zone 4
Lobularia maritima
✅ Sweet Alyssum thrives in zone 4 (hardy 2–11)
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
May – October
Peak bloom
July
Sun required
full sun, part sun
Mature height
6"
Spacing
6" apart
Type
annual
How to plant Sweet Alyssum in zone 4
Honey-scented carpet. Direct-sow or transplant after last frost. Shear back in mid-summer for a rebloom.
Pair with these for continuous bloom
Sweet Alyssum peaks in July. These companions keep your bed in color before and after.
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