Zone 9 · Sea Holly

Planting Sea Holly in Zone 9

Eryngium planum

✅ Sea Holly thrives in zone 9 (hardy 4–9)

Can I plant today?

Plants set out in early season are peaking. Deadhead to keep blooms coming.

Evaluated for July 28, 2026 ·

Zone's last frost

around February 15

Zone's first frost

around December 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 9

Plant in spring in dry, well-drained soil. Steel-blue bracts are striking fresh or dried.

Sea Holly peaks in August. These companions keep your bed in color before and after.

Shasta Daisy

Peaks in July

Purple Coneflower

Peaks in July

Daffodil

Peaks in April

Bee Balm

Peaks in July

Want a full bed designed for zone 9?