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Can You Grow Florence Fennel in Hawaii?

US · USDA Zone 12b · zones 9b, 10a, 10b, 11a, 11b, 12a, 12b

Won't grow here

Fennel needs a moderate growing season — extreme cold or heat both cause problems.

Plant zones

4a–9b

Hawaii last frost

no frost

Hawaii first frost

no frost

Days to harvest

65–90 days

When to plant Florence Fennels in Hawaii

Direct sow

Jan 1

Harvest

Mar 7 – Apr 1

Dates are approximate, based on Hawaii's average frost dates. Your exact yard may vary by microclimate.

About Florence Fennel

Florence fennel produces an anise-flavored bulb at the base — sliced raw into salads or roasted, it is a Mediterranean staple. Note: fennel inhibits nearby plant growth, so keep it isolated in the garden.

Direct sow after last frost — fennel dislikes transplanting. Sow 1/4 inch deep, thin to 12 inches. Keep soil consistently moist while bulbing. Harvest when bulbs are 3 inches wide. Do NOT plant near tomatoes or peppers.

Full florence fennel growing guide →

Gardening in Hawaii

Hawaii is tropical with year-round warmth. Zone varies dramatically by elevation — coastal areas are Zone 11-12 while Mauna Kea slopes reach Zone 9. Year-round growing throughout.

See what grows well in Hawaii →

Frequently asked questions

Can you grow Florence Fennel in Hawaii?

Fennel needs a moderate growing season — extreme cold or heat both cause problems.

What zone is Hawaii?

Hawaii spans USDA Zone 12b (9b, 10a, 10b, 11a, 11b, 12a, 12b).

When do you plant Florence Fennels in Hawaii?

Plant Florence Fennels Jan 1, harvest Mar 7 – Apr 1.