Zone 9 · Sunflower

Planting Sunflower in Zone 9

Helianthus annuus

✅ Sunflower thrives in zone 9 (hardy 2–11)

Can I plant today?

Sunflower has a specific planting window in zone 9. Check back in spring.

Evaluated for April 27, 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

72"

Spacing

18" apart

Type

annual

How to plant Sunflower in zone 9

Direct-sow after last frost, 1 inch deep.

Sunflower 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?