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How to Grow Fennel

Fennel is a versatile herb and vegetable renowned for its sweet, anise-like flavor and aromatic seeds. Its feathery leaves and umbrella-like flower clusters are beautiful and also attract beneficial insects.  This guide will walk you through how to grow fennel, with special tips for growing fennel in hot climates like the low desert of Arizona.

How to Grow Fennel

Article outline:


When to Plant Fennel

In most areas, the ideal time to sow fennel seeds is in early spring after the last frost has passed. For gardeners in hot summer climates, such as the low desert of Arizona, the optimal planting window is from October through January.

How to Grow Fennel

How to Plant Fennel

Fennel prefers to be grown directly from seeds sown in the garden. Direct sowing minimizes root disturbance, which fennel is particularly sensitive to. If you use transplants, handle the roots carefully to avoid damaging them. Learn more about crops with sensitive roots.

Space the plants about 12 inches (30 cm) apart to provide ample room for bulb development. In a square-foot gardening setup, allocate up to 4 plants per square foot to optimize space. Planting fewer per square results in larger bulbs. I like to plant 4 per square and then harvest smaller bulbs early in the season and allow the final bulbs to grow larger. Learn more about square-foot gardening.

How to Grow Fennel

Best Location to Plant Fennel

Choose a location that receives full sun to partial shade. In hot climates, partial shade during the hottest part of the day can help prevent the plant from bolting prematurely. The soil should be well-draining and rich in organic matter.

Fennel possesses allelopathic properties that can inhibit the growth of many garden plants, so it’s generally recommended to plant it separately to avoid adverse effects on crops like tomatoes, beans, peas, and carrots


Caring for Your Fennel Plant

Keep the soil evenly moist but not soggy; mulching around the base can help retain moisture and regulate soil temperature. 

How to Grow Fennel

When and How to Harvest Fennel

The feathery leaves can be harvested once the plant is established and about 12 inches (30 cm) tall. Snip them as needed for culinary use. Don’t remove more than ⅓ at a time to allow the plant to thrive. 

Fennel bulbs are ready to harvest when they reach the size of a tennis ball. Use a sharp knife to cut the bulb at the soil level. Harvesting at the right time ensures the best flavor and texture. 

After harvesting the bulb, you can regrow fennel from the remaining root base. Leave about an inch (2.5 cm) of the base in the soil, and new shoots will emerge

How to Grow Fennel

Attracting Beneficial Insects and Saving Seeds

If fennel bolts, leave it in place to form the tall flowering stalk. The flowers attract pollinators and beneficial insects like ladybugs and lacewings. These beneficial insects play a crucial role in pest control and biodiversity in your garden. Learn more ways to attract them here.

Allow the flower heads to mature and turn brown before collecting the seeds. Cut the seed heads and place them in a paper bag to dry. Once dried, the seeds can be easily separated and used for cooking or future planting.

How to Grow Fennel

Supporting Swallowtail Butterflies

Fennel plays a significant role in supporting the life cycle of swallowtail butterflies. Arizona’s state butterfly, the two-tailed swallowtail larvae, can often be seen enjoying the plants. The butterflies lay their eggs on fennel plants, and the emerging caterpillars feed on the foliage.

How to Grow Fennel

Source: 

https://azlibrary.gov/state-symbols/state-butterfly


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