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When to plant
fennel in the UK
Sow after midsummer for best bulbs — earlier sowings often bolt. Don't transplant bare-root, it hates root disturbance. Use modules.
Growing journey
14 weeks from planting out to harvest · Start indoors 6 weeks before planting out
Get fennel seeds
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What fennel need
Full sun. Well-drained, fertile soil. Regular water.
Spacing
30cm between plants
Give each plant room to spread. Overcrowding reduces yield.
Varieties to try
Keep apart from
- Tomatoes
- Carrots
When to sow fennel
Based on UK average frost date. Enter your postcode for exact dates, or find your city.
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Where to buy fennel seeds
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Get your exact dates
Enter your postcode for personalised planting dates for fennel.