vegetable
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Florence Fennel

Foeniculum vulgare var. azoricum

Florence fennel produces swollen, anise-flavoured bulbs that are delicious raw in salads, roasted with olive oil, or braised as a side dish. It's a beautiful plant too, with feathery, bright green foliage that adds elegance to the vegetable patch. The key to success in the UK is timing — sow too early and it bolts before forming a bulb. Wait until mid-June or July to sow directly where it's to grow, in drills 1cm deep. It needs a warm, sunny position in light, well-drained soil. Transplanting often triggers bolting, so direct sowing is strongly recommended. Keep the soil consistently moist; any drought stress causes bolting. Once the bulbs start to swell, earth up soil around them (like celery) to blanch the base and improve flavour. Harvest when the bulbs are tennis ball-sized — don't leave them too long or they become tough and woody. Cut the bulb at soil level, leaving the root — it will often resprout to produce small, usable secondary shoots. 'Romanesco' and 'Finale' are reliable bolt-resistant varieties for UK growing. The feathery fronds can be used as a herb, similar to dill, in fish dishes and salads.

Plan where to grow Florence Fennel using our vegetable garden planner.

SunlightFull sun
WateringModerate
Height60cm
Spacing30cm
Germination10–14 days
Sowing MethodDirect sow
Frost HardinessHalf-hardy
Sowing Depth1cm

When to Sow Florence Fennel

Sow florence fennel in June, July.

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Sowing months

Time to Harvest Florence Fennel

Expect to harvest approximately 3 months after sowing.

Companion Plants

Expected Yield

One bulb per plant, tennis ball-sized when ready. Fronds usable as a herb throughout the season.

Growing Tips

Sow mid-June to July to avoid bolting; direct sow only

Common Problems with Florence Fennel

Bolting before bulbing

The most common problem. Caused by sowing too early (before mid-June), transplant shock, drought, or cold nights. Direct sow after midsummer, keep soil consistently moist, and use bolt-resistant varieties like 'Romanesco'. Once a plant bolts, the bulb won't develop — pull it up and use the foliage as a herb.

Aphids on foliage

Greenfly sometimes colonise the feathery foliage, weakening the plant and potentially affecting bulb development. Blast off with water, spray with organic soap-based insecticide, or encourage natural predators. Usually a minor problem that doesn't severely impact the crop.

Slugs on developing bulbs

As bulbs swell at ground level, they become targets for slugs, which gouge holes in the crisp flesh. Earth up soil around bulbs, use organic slug pellets or nematode controls, and harvest promptly when ready. Growing in raised beds helps reduce slug damage.

Plan your florence fennel in the allotment planner

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