Fennel
Feathery, anise-scented fennel is a kitchen garden staple that doubles as a magnet for swallowtail butterflies and beneficial insects.
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Ancient Herb, Modern Garden Star
Fennel has been cultivated around the Mediterranean for thousands of years, prized by the ancient Greeks and Romans for both its culinary and medicinal virtues. Every part of the plant is useful: the crisp bulb, tender fronds, hollow stems, and licorice-kissed seeds all find their way into kitchens across Europe, India, and beyond.
There are two main types to know. Florence fennel (var. azoricum) is grown for its swollen, bulbous base and is treated as a vegetable. Common fennel is cultivated for its feathery foliage and aromatic seeds. Bronze fennel (var. purpurascens) brings dramatic copper-toned fronds to the ornamental garden, looking gorgeous alongside bright flowers.
Planting & care
Sow seeds directly in the garden after the last frost date, or start indoors 4 weeks prior in biodegradable pots, as fennel dislikes root disturbance. Choose a sunny, well-drained spot and thin seedlings to 12 inches apart. Fennel prefers moderately fertile soil and actually performs poorly in overly rich beds, which produce lush foliage but weak flavor.
Water consistently but avoid waterlogging, as fennel is drought-tolerant once established. For Florence fennel bulbs, mound soil around the base (blanching) when the bulb reaches golf-ball size to keep it tender and mild. Cut flower heads before they set seed if you want to prevent aggressive self-seeding. In Zones 6 and above, established plants will often return from the roots each spring.
Keep It Away From the Neighbors
Fennel is famously allelopathic and releases compounds from its roots that inhibit the growth of nearby plants. Keep it well away from tomatoes, peppers, beans, and most brassicas. Plant it at the garden's edge or in its own dedicated bed, and you will avoid a lot of puzzling crop failures.
How much sun does Fennel need?
Fennel grows best in full sun.
How often should you water Fennel?
Give it about 1 in per week.
When is Fennel ready to harvest?
Fennel is usually ready in 60-90 days for bulb; foliage harvested anytime; seeds at 90-115 days.