Fennel care guide
Foeniculum vulgare
Also known as: Sweet fennel, Florence fennel
Pets and children
We haven't been able to confirm how this plant affects pets or small children. If any is eaten, consult a veterinarian or a doctor.
How often to water Fennel
- Spring–Summer (Mar–Sep)
- Every 2 days
- Water thoroughly once the topsoil is dry, as a guide; a big plant drinks a lot, so check in the morning in midsummer.
- Autumn (Oct–Nov)
- Every 4 days
- Cooler weather slows drying, so water a day or two after the soil dries, as a guide.
- Winter (Dec–Feb)
- Every 7 days
- With the top died back and resting, a light watering a few days after the soil dries is the guide.
Light and placement for Fennel
Generally wants full sun, with a sunny outdoor spot as the guide; it reaches about 1 to 2 m, so pick a sheltered spot or have a stake ready.
Overwintering Fennel
Overwintering guide: −10°C (14°F) or above
A hardy perennial that generally stays outdoors over winter as a guide: the top dies back and new shoots rise from the base in spring, with sparing water in between.
Fertilizing and repotting Fennel
Fertilizer
Needs little: a bit of slow-release fertilizer or diluted liquid feed about twice a month in spring and fall, as a guide, and none in midsummer or winter.
When to repot
Spring–Summer (Mar–Sep), Autumn (Oct–Nov)
Common problems with Fennel
- Transplanting damages the taproot and the plant declines and dies.
- Swallowtail caterpillars strip the foliage.
- In a small pot it dries out constantly and the lower leaves yellow.
- It grows tall and is knocked over by wind.
Tips for growing Fennel
- Sow directly in a deep pot, or plant while small without disturbing the roots.
- It crosses easily with dill planted nearby, so keep the two apart.
- The flowers and seeds are fragrant too; dry the seeds for use as a spice.
These are AI-generated general guidelines. They vary with the variety, the placement and the pot size. For effects on pets or children, consult a veterinarian or a doctor.
Keep your plant log going
Greenery is a free app that keeps your plant care going, with watering reminders and photo records. Available on iOS and Android.
