Fennel (herb) Planting Guide

Herb fennel is grown for its aromatic leaves, stalks, and seeds rather than a bulb. It has a strong anise flavor and its flowers attract beneficial insects.

Foeniculum vulgare · Herb · Apiaceae family · 60–90 days to maturity

Get Your Personalized Fennel (herb) Planting Dates

Enter your ZIP code to see exact planting dates, soil compatibility, and growing tips specific to your county.

Where Can You Grow Fennel (herb)?

Zone Compatibility for Fennel (herb) Zones 4a – 10b

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

Ideal (data available) Suitable Marginal Not recommended

Planting Dates by Zone

Zone	Start Indoors	Direct Sow	Transplant	Harvest
Zone 4a	Mar 25	Apr 29	Apr 29	Jul 1 – Sep 9
Zone 4b	Mar 20	Apr 24	Apr 24	Jun 26 – Sep 4
Zone 5a	Mar 21	Apr 11	Apr 18	Jun 20 – Aug 29
Zone 5b	Mar 14	Apr 4	Apr 11	Jun 13 – Aug 22
Zone 6a	Mar 6	Mar 27	Apr 3	Jun 5 – Aug 14
Zone 6b	Feb 27	Mar 20	Mar 27	May 29 – Aug 7
Zone 7a	Feb 18	Mar 11	Mar 18	May 20 – Jul 29
Zone 7b	Feb 11	Mar 4	Mar 11	May 13 – Jul 22
Zone 8a	Feb 1	Feb 22	Mar 1	May 3 – Jul 12
Zone 8b	Jan 21	Feb 11	Feb 18	Apr 22 – Jul 1
Zone 9a	Jan 13	Jan 20	Feb 3	Apr 7 – Jun 16
Zone 9b	Dec 28	Jan 4	Jan 18	Mar 22 – May 31
Zone 10a	Dec 4	Dec 11	Dec 25	Feb 26 – May 7
Zone 10b	Dec 4	Dec 11	Dec 25	Feb 26 – May 7

How to Plant Fennel (herb)

Planting Depth

15"

Between Plants

24"

Between Rows

🍂 Fall planting: Sow 10 weeks before your first frost date for a fall harvest.

Growing Conditions

☀️ Sun

Full Sun (6-8+ hours)

💧 Water

Moderate — regular watering

Water when the top inch of soil feels dry. Consistent moisture produces the best results.

🧪 Soil pH

5.5 – 7

Prefers neutral to slightly acidic soil — ideal for most garden beds.

🗺️ Hardiness Zones

Zone 4a – 10b

📅 Days to Maturity

60–90 days

Quick-growing crop. Multiple plantings per season are possible.

👪 Plant Family

Apiaceae

Rotate with other families yearly to prevent soil-borne diseases. Don't plant in the same spot where Apiaceae family crops grew last year.

Succession Planting Fennel (herb)

Fennel (herb) matures in just 60–90 days, making it ideal for succession planting. In a typical 180-day growing season, you can get up to 3 successive plantings by sowing every 6.9 weeks.

Your actual succession count depends on your local frost dates. Enter your ZIP code to get personalized succession planting dates for your area.

Companion Planting for Fennel (herb)

✅ Good Companions

Peas Lettuce

❌ Keep Away From

Tomatoes Peppers Green Beans

Check more combinations with our Companion Planting Checker →

Growing Tips for Fennel (herb)

Direct sow in spring or fall. Unlike Florence fennel, herb fennel does not form a bulb. Harvest fronds as needed and seeds when they turn brown. Self-sows readily.

Saving Fennel (herb) Seeds

Recommended for Your Garden

🪴

Fabric Grow Bags $10-25

Breathable fabric pots that promote healthy root growth and prevent overwatering.

🏺

Self-Watering Planters $15-40

Built-in reservoir keeps herbs and greens consistently watered with less effort.

🌱

Seed Starting Trays $8-20

Start seeds indoors with reusable cell trays and humidity domes.

Level Up Your Garden

Seed Saving & Storage Guide

Learn when to harvest, how to dry, and how to store seeds from 200 plants. Never buy seeds again.

Learn More →

Fennel (herb) by State

Frequently Asked Questions

How long does it take to grow Fennel (herb)?

Fennel (herb) (Foeniculum vulgare) takes 60 to 90 days from planting to harvest. Exact timing depends on your variety, growing conditions, and USDA zone.

What zones can Fennel (herb) grow in?

Fennel (herb) can be grown in USDA zones 4a through 10b. Use the planting calendar above to find the exact dates for your zone.

How much sun does Fennel (herb) need?

Growing Fennel (herb) requires Full Sun (6-8+ hours), Moderate — regular watering, and soil pH of 5.5 to 7.

Blog