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Florence fennel plants with plump white bulbs and feathery green fronds in a sunny garden bed

How to Grow Florence Fennel From Seed

Updated November 2026

Florence fennel is the bulbing form of fennel (Foeniculum vulgare var. azoricum), grown for the crisp, white, anise-sweet bulb that swells at the base of its stems. Herb fennel stays slim at the base and is grown for its fronds and seed, but Florence fennel puts its energy into that bulb, as long as you give it cool weather and steady water. You still get the extras: feathery fronds for the kitchen and, if you let a plant flower, seed for the spice rack.

Ready to grow your own? Shop Florence Fennel Seeds from Organo Republic.

Quick start

Sow the seed where it will grow, about 1/4 inch deep, in early summer once the soil passes about 60F, or in mid to late summer for a fall crop, the more reliable choice for big bulbs. Thin to 6 to 12 inches apart and keep the soil evenly moist. When the base starts to swell, mound soil around it to keep the bulb pale and tender, then cut the bulbs when plump and firm, about 80 to 100 days from sowing.

Best tip

Make fall your main crop. Sow in mid to late summer so the bulbs swell as nights cool and days shorten, the conditions that keep fennel from bolting. Spring sowings face cold snaps early on, then lengthening days and rising heat, and any of these can send it to flower before it bulbs.

At a glance

How to Grow Florence Fennel From Seed — growing specifications at a glance
Botanical nameFoeniculum vulgare var. azoricum
Plant typeCool-season annual grown for its bulb
USDA zones2 to 11 (grown as a cool-season annual)
SunFull sun
Days to maturity80 to 100 days (bulb)
Height24 to 36 inches
Spacing6 to 12 inches apart
WaterRegular; keep soil evenly moist

Uses

Slice the bulb paper thin and eat it raw with citrus and olive oil, or roast, grill, or braise wedges until they turn sweet and silky; cooking mellows the anise flavor a lot. Chop the fronds and scatter them like dill over fish, potatoes, or salads. The tougher stalks flavor stocks and soups, and dried seed from a flowering plant goes into sausage, bread, and spice rubs.

Frequently asked questions

What does Florence fennel taste like?

Mild, sweet anise. Raw, the bulb is crisp and juicy with a light licorice note; roasted or braised, it turns soft, sweet, and much milder. The fronds taste lighter still, while the dried seeds carry a stronger, warmer anise flavor.

Is Florence fennel the same as anise?

No. Grocery stores sometimes label fennel bulbs as anise or sweet anise, but true anise (Pimpinella anisum) is a different plant, an annual grown for its seed that never forms a bulb. They taste alike because both contain the aromatic compound anethole.

Can you eat the stalks and fronds of Florence fennel?

Yes, every part above ground is edible. Use the fronds like a fresh herb, much as you would dill. The stalks are stringier than the bulb, so slice them thin or simmer them in stocks and soups. The flowers and dried seed add anise flavor too.

Will Florence fennel grow back after you cut the bulb?

Partly. Cut the bulb just above the soil line and leave the roots in place, and the stub often sends up a few small, leafy shoots you can snip into salads. It will not form a full second bulb, so sow again for another crop.

Ready to grow your own? Heirloom Florence fennel seeds give you crisp, anise-sweet bulbs, feathery fronds, and seed from a single sowing. For the full step-by-step, see our complete fennel growing guide linked at the top of this page.

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Maxim Kaufman, Founder and CEO of Organo Republic

By Maxim Kaufman — Founder & CEO, Organo Republic

Maxim founded Organo Republic in 2017 and personally selects and supervises the quality control of the heirloom, non-GMO varieties the company offers. Under his leadership, Organo Republic was named Agri Business Review’s Top Non-GMO Seed Variety Solution 2026.

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