Zone 4 · Sea Holly
Planting Sea Holly in Zone 4
Eryngium planum
✅ Sea Holly thrives in zone 4 (hardy 4–9)
Can I plant today?
🌸 Sea Holly should be blooming now!
Plants set out in early season are peaking. Deadhead to keep blooms coming.
Evaluated for July 28, 2026 ·
Zone's last frost
around May 15
Zone's first frost
around September 15
Bloom window
July – September
Peak bloom
August
Sun required
full sun
Mature height
36"
Spacing
18" apart
Type
perennial
How to plant Sea Holly in zone 4
Plant in spring in dry, well-drained soil. Steel-blue bracts are striking fresh or dried.
Pair with these for continuous bloom
Sea Holly peaks in August. These companions keep your bed in color before and after.
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