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Can You Grow Florence Fennel in Illinois?

US · USDA Zone 5b · zones 4a, 4b, 5a, 5b, 6a

Grows well here

Florence fennel grows well here — it likes warm days and cool nights for bulb development.

Plant zones

4a–9b

Illinois last frost

early April

Illinois first frost

late October

Days to harvest

65–90 days

When to plant Florence Fennels in Illinois

Direct sow

Apr 7

Harvest

Jun 11 – Jul 6

Dates are approximate, based on Illinois'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 Illinois

Illinois has a humid continental climate with hot summers and cold winters. Chicago is Zone 5b-6a; southern Illinois is warmer at Zone 6-7. Classic Midwest growing region.