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How to Grow Fennel

Reviewed by MyLocalPlanting Editorial Team Updated Sources
Fennel (Foeniculum vulgare)

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Supplies You'll Need

Seed Starting Trays Seed Starting Mix Grow Lights Heat Mat Raised Garden Bed Vegetable Garden Soil Hand Trowel Set Watering Can

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Plant Overview

Scientific Name Foeniculum vulgare
Category vegetable
Days to Maturity 80 days
Starting Method Start Indoors

Growing Requirements

Sun

Full Sun

Water

Regular

Germination

7-14 days

Ready to Grow Fennel?

Find quality seeds from trusted suppliers.

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Seed Saving Guide

Easy
Open-pollinated — seeds grow true to parent

When to Harvest Seed

Harvest umbels when seeds turn gray-green to brown — just before they drop.

Processing

Cut seed heads into a bag, dry 1–2 weeks, thresh to separate seeds.

Seed Viability

Up to 4 years when stored cool, dark, and dry.

Pro Tip

Fennel cross-pollinates with dill — keep at least 300 feet apart or sacrifice one crop when saving seed.

Seed Storage Supplies

Seed Envelopes Mylar Storage Bags Silica Gel Packets Seed Organizer

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Fennel Planting Calendar by Zone

Zone 1a Zone 1b Zone 2a Zone 2b Zone 3a Zone 3b Zone 4a Zone 4b Zone 5a Zone 5b Zone 6a Zone 6b Zone 7a Zone 7b Zone 8a Zone 8b Zone 9a Zone 9b Zone 10a Zone 10b Zone 11a Zone 11b Zone 12a Zone 12b Zone 13a

Fennel Planting Calendar by State

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Frequently Asked Questions

When should I plant Fennel? +

Start Fennel seeds indoors 4 weeks before your last frost date, then transplant outdoors -2 weeks after the last frost. Use the search on this page to find exact dates for your ZIP code or city.

How long does Fennel take to grow? +

Fennel typically matures in about 80 days from planting. Exact timing varies by variety, soil conditions, and local climate.

Should I start Fennel indoors or direct sow? +

Fennel should be started indoors 4 weeks before the last frost date. This gives seedlings time to establish before being transplanted outside after frost danger has passed.

How much sun does Fennel need? +

Fennel requires full sun to thrive.

How much water does Fennel need? +

Fennel has regular water needs. Consistent moisture is important especially during germination and early growth.

Can you save seeds from Fennel? +

Yes — seed saving difficulty for Fennel is rated easy. Harvest umbels when seeds turn gray-green to brown — just before they drop. Cut seed heads into a bag, dry 1–2 weeks, thresh to separate seeds.

How long do Fennel seeds last in storage? +

Properly dried and stored Fennel seeds remain viable for up to 4 years. Store in a cool, dark, dry location in an airtight container with a silica gel packet for best results.

Are Fennel seeds open-pollinated? +

Yes — Fennel is open-pollinated, meaning seeds saved from your harvest will grow plants true to the parent variety. This makes it an excellent candidate for building a self-sustaining garden.

About Fennel

Fennel is allelopathic to most garden plants, inhibiting growth, causing to bolt, or actually killing many plants

Expect your Fennel to be ready for harvest in approximately 80 days from planting.

Use the search above or browse by zone or state to find the perfect planting dates for your location.