Florence Fennel is a Mediterranean heirloom that transforms from delicate seedling into an upright plant reaching 24-36 inches tall, crowned with feathery green fronds and swollen white bulbs that taste of sweet anise and celery. This botanical variety (Foeniculum vulgare var. azoricum) developed in the 17th century and remains a cornerstone of Italian cuisine, delivering a crisp, gourmet bulb ready to harvest in roughly 80 days. Hardy from zones 5-9 and frost-tolerant enough to stretch your season, it grows equally well in garden beds, raised beds, or containers, asking only for full sun, moderate water, and the space to spread its delicate foliage.
Photo © True Leaf Market
Growing Conditions
USDA Zone
5-9
Sunlight
Full Sun
Water
Moderate
Soil
Well-drained, Fertile Loam; Tolerates Poor Soil
Preferred Temp60-75°F
Growth Stats
36 in
Height
24 in
Width
12 in
Spacing
80–80
Days to Harvest
PeriodAnnual
TypeHerbaceous
Plant Profile
Sunlight
Full Sun
Water
Moderate
Zones
5-9
Size
36in H x 24in W
Growth
Annual
Care
Moderate
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Highlights
The swollen celadon bulbs burst vertically into a mist of fine-leaved stems that bring airiness and brightness to the garden, while the crisp white bases offer a sweet, mildly-flavored treat that rivals anything at the farmers market. Florence fennel deserves space in every garden not just for the exceptional bulbs, but for the architectural beauty it brings: the feathery fronds provide garden structure, attract butterflies and pollinators, and resist deer. Catalogs call it luscious and pleasantly flavored, easy to grow, and, when harvested at the right moment, a positively gourmet experience that home gardeners often overlook.
Common Uses
The crisp, white bulb is the star: use it raw and chopped in salads for a fresh licorice note, roast it alongside other vegetables for a caramelized sweetness, or braise it slowly in broth until tender. The feathery green fronds add bright flavor to salads, finish plates with an herbaceous touch, and steep into tea. Fennel bulbs shine in juices blended with citrus, dips, and fresh preparations that let their delicate apple-anise-celery character shine. Home cooks have discovered that half a fennel bulb juiced with seven oranges and a bit of lemon creates a wonderful zesty health drink.
Growing Timeline
First Bloom
Mid-summer
First Harvest
Early Autumn
Last Harvest
Late Autumn
Care Instructions
Direct Sow
Sow seed directly in the garden in mid-spring several weeks before your last frost date, or in late summer for a fall crop. Barely cover seeds with soil; they prefer light. Keep soil uniformly moist after sowing to support germination and establishment. Fennel will self-sow in favorable conditions, so plan accordingly if you want to prevent unintended seedlings.
Harvesting
Harvest bulbs approximately three weeks after they begin to form, or when the basal stems have visibly swollen into compact white bulbs. The bulbs should feel firm to the touch and measure roughly 3-4 inches across at the widest point. Cut the bulbs at soil level with a sharp knife, leaving the roots in place if you wish to allow the plant to regenerate fronds for a second harvest. Fennel bulbs are best used fresh but can be stored for several weeks if kept cool and moist.
Pruning
Remove spent flowering stems before seed is fully produced if you wish to prevent self-seeding throughout the garden. Otherwise, allow the plant's natural upright branching habit to develop without intervention.
Growing Calendar
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Companion Planting
Pests & Diseases
Ecology & Traits
Deer ResistantAttracts PollinatorsEdible
Bloom Time
July To August
Attracts
Butterflies
Tolerances
Deer
Scientific Classification
Foeniculum Mill.
Family
Apiaceae
Genus
Foeniculum
Duration
Annual
Growth Habit
Upright
Native Status
L48 (I)HI (I)PR (I)VI (I)CAN (I)
History & Origin
“Florence fennel's story begins in the Mediterranean basin, where it was developed in the 17th century as a refinement of wild fennel. Italian gardeners and cooks recognized the potential in swollen basal stems and carefully selected seed across generations to create the bulbing varieties we grow today. This heirloom reached the seed catalogs of the modern gardening world as open-pollinated, non-GMO stock, preserved and passed down by seed savers who understood that fennel belonged not just in herb gardens but in vegetable beds. Its journey from Mediterranean kitchen gardens to global cultivation reflects both its culinary value and the dedication of heirloom breeders who saw fennel as essential.”