Zone 3 · Swamp Milkweed
Planting Swamp Milkweed in Zone 3
Asclepias incarnata
✅ Swamp Milkweed thrives in zone 3 (hardy 3–9)
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
July – August
Peak bloom
July
Sun required
full sun
Mature height
48"
Spacing
24" apart
Type
perennial
How to plant Swamp Milkweed in zone 3
Plant in spring in moist soil. Monarch host plant; more garden-polite than common milkweed.
Pair with these for continuous bloom
Swamp Milkweed peaks in July. These companions keep your bed in color before and after.
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