Zone 4 · Moss Rose
Planting Moss Rose in Zone 4
Portulaca grandiflora
✅ Moss Rose 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
June – September
Peak bloom
July
Sun required
full sun
Mature height
6"
Spacing
8" apart
Type
annual
How to plant Moss Rose in zone 4
Direct-sow after last frost in dry, poor soil. Thrives in heat and drought — perfect for hellstrips.
Pair with these for continuous bloom
Moss Rose peaks in July. These companions keep your bed in color before and after.
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