A practical vegetable garden series
Grow Florence fennel for crisp, sweet, anise-scented bulbs and feathery leaves.
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GROW WITH US Florence fennel is grown for a crisp, pale base with a sweet aniseed flavour. Sow it in warm soil in early summer, keep it evenly moist and harvest the rounded base before it stretches into a flower stem. Use the feathery fronds too, and remember that herb fennel is grown mainly for leaves, flowers and seeds. |
Written for home gardeners in Hungary
CHAPTER WELCOME
Your fennel season starts here
This book follows the whole journey: seed → seedling → garden → care → harvest → kitchen → next season.
Florence fennel is grown for its pale, swollen base, with a fresh, gently aniseed flavour. It is sometimes called bulb fennel, although it is not a true bulb. The plant also makes delicate fronds that are useful in the kitchen. This guide focuses on Florence fennel; herb fennel is grown mainly for its leaves, flowers and seeds.
In Hungary, sow Florence fennel outdoors in early to mid-summer, when the soil is warm. Near Győr, a late June or early July sowing gives the crop time to swell before autumn cold. Keep the soil evenly moist: dry spells, cold starts and root disturbance can all encourage bolting, when the plant flowers instead of forming a tender bulb.
Our Hungarian calendar
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June–early July |
Direct sow outdoors once the soil is warm. |
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June–July |
Keep seedlings watered and thin carefully. |
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Summer |
Water often; mulch to conserve moisture. |
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Late summer |
Check bases and harvest mini fennel as needed. |
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September–October |
Harvest full-size bases before they elongate. |
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Autumn |
Protect late plants from early frost; use promptly. |
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WHAT I WOULD DO I would direct sow one short row in late June, thin it carefully and keep it watered through summer. I would sow a second, smaller row in early July, then harvest each base while it is still round and firm. |
The rule for this series: dates guide us, but the plant and the weather make the final decision.
CHAPTER 1
Meet the Fennel
Florence fennel makes a pale swollen base from the overlapping leaf stalks.
Florence fennel (Foeniculum vulgare var. azoricum) forms a rounded, pale base at soil level. This “bulb” is made from overlapping, swollen leaf stalks, not from a true bulb. It has a sweet, mild aniseed flavour and can be eaten raw or cooked. The feathery leaves, called fronds, are also aromatic. Herb fennel is a close relative, but it grows taller and is usually grown for its leaves, flowers and seeds rather than a swollen base.
Florence or herb fennel?
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Florence fennel |
Forms a swollen, edible base and aromatic fronds. |
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Herb fennel |
Grows taller; valued mainly for leaves, flowers and seeds. |
Two related plants, grown for different harvests
· Florence fennel: grown for the swollen leaf-stalk base and fronds.
· Herb fennel: grown mainly for its feathery leaves, flowers and seeds.
· A “bulb” of leaf stalks: the pale base develops at soil level.
· Warm-season sowing: early sowings can bolt before forming a bulb.
· Even moisture: dry soil can trigger flowering and woody bulbs.
· Aromatic fronds: use the fine leaves to flavour salads and cooked dishes.
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GOOD TO KNOW The “bulb” of Florence fennel is not a true bulb. It is made from the overlapping, swollen bases of the leaf stalks. |
CHAPTER 2
Choose Your Fennel
Choose Florence fennel for bulbs, and look for a bolt-resistant variety if you want to try an earlier sowing.
Ask yourself five questions
1. Am I growing Florence fennel for its swollen base?
2. Can I wait until early summer to sow into warm soil?
3. Do I have a sunny spot with fertile, free-draining soil?
4. Can I keep the soil evenly moist through summer?
5. Would I like full-size bulbs or quick mini fennel?
A beginner-friendly first planting
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Sow in warmth |
Early sowings can bolt after cold spells. |
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Handle roots gently |
Fennel dislikes transplanting and root disturbance. |
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Keep soil moist |
Dry conditions can trigger bolting and woody bases. |
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Choose the right seed |
Look for Florence fennel, not herb fennel. |
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A COMMON MISTAKE Starting too early outdoors. Cold conditions while young can make fennel bolt before a useful base forms. |
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TRY THIS Grow Florence fennel and herb fennel side by side. Compare their growth and harvests: one forms a swollen base, while the other is grown for fronds, flowers and seed. |
CHAPTER 3
Let’s Sow
Florence fennel dislikes cold starts and root disturbance. For the simplest crop, sow it directly where it will grow once the soil has warmed in early summer. If you want to start earlier, sow one seed per module and transplant the whole root ball gently. Small, repeated sowings help spread the harvest and reduce the risk of losing the whole crop to bolting.
When to sow in Hungary
Direct sow in June or early July, when the soil is warm and the risk of cold spells is lower. Make a shallow drill about 1.5 cm deep, water the base of the drill if dry, then sow thinly. Space rows about 30 cm apart. Thin gradually to 30 cm between full-size plants, taking care not to disturb the roots of those left growing. For mini bulbs, plants can be closer, about 10–15 cm apart. Keep the seedbed moist until seedlings establish.
What you need
· Florence fennel seed, preferably a bolt-resistant variety
· A sunny, sheltered bed with fertile soil
· A rake and hand fork for a fine seedbed
· A watering can with a fine rose
· Plant labels and a pencil for variety and sowing date
Sowing, step by step
1. Choose a warm, sunny bed; remove weeds and rake the surface level.
2. Make a shallow drill about 1.5 cm deep and water it if the soil is dry.
3. Sow seeds thinly, cover with fine soil and label the row.
4. Keep the soil evenly moist while the seeds germinate.
5. Thin gradually to 30 cm apart for full bulbs, or 10–15 cm for mini fennel.
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DON’T PANIC The base is made from leaf stalks, so it will not look like an onion or garlic bulb. It swells at soil level as the plant grows. |
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A COMMON MISTAKE Letting the soil dry out during summer. Fennel needs even moisture to form a tender base and is prone to bolting in dry conditions. |
CHAPTER 4
Seedling School
Fennel seedlings look fine and feathery at first. Keep them moist and thin them carefully so the remaining plants can develop undisturbed roots.
Recognise young fennel
Young Florence fennel seedlings soon make delicate, threadlike fronds with a fresh aniseed scent when gently crushed. Keep the row weed-free and water it regularly. Thin in stages, snipping extra seedlings at soil level if pulling them might disturb neighbouring roots. If you started seeds in modules, transplant them while small and keep each root ball intact.
Why is my fennel flowering already?
A flower stem, or bolt, may appear after cold conditions early in growth, root disturbance during transplanting or a hot, dry spell. Once the plant bolts, the base often stays small or becomes woody. Sow outdoors after the soil warms, choose a bolt-resistant variety, handle roots gently and never let the soil dry out completely. If a plant bolts, use any tender leaves and harvest the base promptly.
Water while they settle
Water after sowing and keep the seedbed evenly moist until seedlings are established. Direct-sown plants need steady moisture while their roots develop. Water modules before transplanting, then water each plant in well. Keep checking during hot weather; fennel in pots and raised beds can dry out quickly.
Feeding
Fennel grows best in fertile, free-draining soil. Mix mature compost into the bed before sowing. In a well-prepared garden bed, extra feeding is usually unnecessary. If growing in a container or poor soil, an occasional balanced liquid feed can support steady growth; follow the product label and water first.
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WHAT I WOULD DO I would sow into a sunny bed after the soil warms, then mulch once plants are established to help the soil stay moist. |
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DON’T PANIC If one plant sends up a flower stem, harvest it promptly while the base is still usable. A bolted plant will not form a tender full-size base. |
CHAPTER 5
Ready for the Real World
Florence fennel grows best when sown straight into its final position. If you raise seedlings in modules, plant them out young and protect their roots from disturbance.
Before planting: check the plants and the bed
1. Choose small, healthy module-grown seedlings with a few feathery leaves.
2. Water modules before planting so the root ball stays together.
3. Harden indoor-grown plants off gradually in mild weather.
4. Prepare a sunny, sheltered bed with fertile, well-drained soil.
5. Set seedlings at the same depth and water them in carefully.
When is it ready in Hungary?
For direct sowing, wait until June or early July, once the soil is warm. If you sowed modules earlier, plant them out from late May onwards only after the last frost and a period of mild weather. Harden them off first and keep the root ball intact. Cold, stressed or root-damaged plants may bolt before they form a good bulb.
Near Győr, aim to get the main crop established by early July so bulbs can develop in late summer and autumn. A late July sowing is a useful experiment for mini fennel, but full-size bulbs may run into autumn cold. Check the forecast and give late plants fleece protection if an early frost is expected.
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A COMMON MISTAKE Transplanting large seedlings or pulling thinnings beside the plants you want to keep. Sow direct when possible, and avoid disturbing roots. |
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GOOD TO KNOW Florence fennel usually takes three to four months to mature, but you can harvest a smaller base earlier. |
CHAPTER 6
Give Them a Good Home
A warm, sunny position and evenly moist, fertile soil help fennel form tender bases.
The right place
Choose a sunny, sheltered spot with fertile soil that drains well but does not dry out quickly. Work mature compost into the bed before sowing. Heavy, waterlogged ground can stunt the crop, while dry soil encourages bolting. Remove weeds before sowing and keep them in check by hand once plants are growing, so you do not damage the shallow developing base.
Spacing
For full-size bulbs, thin plants to about 30 cm apart in rows 30 cm apart. This gives each base room to swell and allows air to move around the foliage. If space is limited, grow plants 10–15 cm apart and harvest them as mini fennel when the base is about 5 cm across. Follow the seed packet if it recommends different spacing for your variety.
Planting day
1. Water modules and prepare a moist, weed-free bed.
2. Make a planting hole large enough for the root ball.
3. Set each seedling at the same depth it grew before.
4. Firm gently and water in without disturbing the roots.
5. Label the row with the variety and planting date.
Growing in pots
Florence fennel can grow in a large container. Use a pot about 40 cm wide with drainage holes and fresh, moisture-retentive compost; grow up to three full-size plants, or space mini fennel closer. Containers dry rapidly, so check moisture often in summer. A compact, bolt-resistant variety is a good choice for pots.
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TRY THIS Sow a short row of mini fennel at closer spacing. Harvest the bases at about 5 cm across for quick, tender portions. |
CHAPTER 7
Water, Feed & Keep Them Growing
Steady moisture and low competition help Florence fennel form a full, tender base.
Watering
Keep the soil consistently moist from sowing until harvest. If it dries out, especially in hot weather, fennel may bolt and the base can turn woody. Water deeply at the soil level in the morning. Check pots every day during warm spells; compost in containers dries much faster than garden soil.
Mulch
Once the seedlings are established, spread mature compost around them to conserve moisture and suppress weeds. Keep the mulch a little away from the crown, and water underneath it in dry weather. Mulch can be especially helpful during Hungary’s hot summer, when even a short dry spell may stress the crop.
Feeding
A bed enriched with mature compost usually provides enough nutrients. If plants are in a container or very light soil, use a balanced liquid feed occasionally once they are established. Avoid feeding dry soil, and follow the directions on the product label. Reliable watering matters more than extra fertiliser.
Keep plants healthy
Hand-weed close to plants so you do not damage the developing base. Check young fennel for slugs and snails, especially after damp weather. When the leaf stalks begin to swell, gently mound a little soil around the base if you want a paler, sweeter bulb; keep soil from falling into the crown. Remove badly damaged leaves and water consistently.
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WHAT I WOULD DO I would check plants weekly from late summer and cut each rounded base before it starts to elongate or flower. |
CHAPTER 8
Fronds, Bulbs & “What Is That?”
Florence fennel grows feathery leaves above a swollen base. Looking closely helps you tell normal growth from a crop that is under stress.
Why is the base small or woody?
Florence fennel needs warm conditions, steady moisture and time to swell. Cold starts, root disturbance, crowding or dry soil can cause it to bolt before a proper base forms. Check the sowing date, keep the bed moist and harvest a small base while it is still tender. If a tall flower stem has appeared, the plant will not make a tender full-size bulb.
The beginner’s trouble guide
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Plants bolt early |
Cold, root disturbance or dry soil may trigger flowering. Sow after warming and keep moisture steady. |
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Base stays small |
Check spacing, sowing date and moisture; harvest smaller rather than waiting until it turns woody. |
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Seedlings disappear |
Slugs and snails may be feeding. Check after damp nights and protect young plants. |
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Base turns woody |
It may have started to bolt. Harvest remaining plants promptly. |
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Plants wilt in pots |
Containers dry fast. Check moisture daily and water thoroughly in warm weather. |
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DON’T PANIC A small base is still edible. Harvest it while firm and tender instead of waiting until it becomes woody. |
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A COMMON MISTAKE Waiting for every base to reach full size. Harvest promptly if a plant starts to elongate or form a flower stem. |
CHAPTER 9
Can I Pick It Yet?
Yes—harvest Florence fennel once the swollen base is large enough to use, before it starts to elongate and flower.
What “ready” looks like
A full-size base is usually ready when it is about 10–15 cm across, though you can harvest it smaller if you prefer. Depending on variety and sowing time, this is often three to four months after sowing. The base should feel firm and still be rounded. If it begins to stretch upward or a flower stem appears, harvest promptly before it turns woody.
Harvest from late summer into autumn
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Mini base |
Harvest from about 5 cm across, while firm. |
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Full-size base |
Usually 10–15 cm across, about three to four months after sowing. |
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Best texture |
Pick before the base elongates or becomes woody. |
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Harvesting |
Cut below the base with a clean knife or lift the whole plant. |
How often should I check?
Check plants weekly from late summer. Harvest each rounded base while it is firm, before a central flower stem forms. Cut just below the base with a clean knife or lift the whole plant. If you cut the base and leave the roots, small leafy shoots may grow, but they will not form another bulb. Pick before severe frost damages the crop.
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READY TO HARVEST? A rounded, firm base about 10–15 cm across is ready for a full-size harvest. Smaller bases are also good to eat; pick before the plant stretches into a flower stem. |
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TRY THIS Shave a small, firm fennel base very thinly and toss it with orange, olive oil and a pinch of salt for a crisp salad. |
CHAPTER 10
From the Garden to the Kitchen
Florence fennel brings crisp texture and a gentle aniseed flavour to salads and cooked dishes.
The first rule: wash between the layers
Trim off the root end, remove any tough outer layer and separate the fronds. Rinse the base well, as grit can collect between its layers. Slice it thinly for salads, or roast, grill, braise or steam it until tender. The feathery fronds add a fresh, aromatic finish to salads, fish, soups and vegetable dishes.
Match fennel to the dish
· Raw: shave thinly into salads with citrus or apple.
· Roasted: cut into wedges and roast with olive oil.
· Braised: cook gently with stock until soft and sweet.
· Fronds: chop finely to garnish fish, soup or salad.
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FROM THE KITCHEN Roast fennel wedges with olive oil until tender and golden. Finish with chopped fennel fronds and a squeeze of lemon. |
Storing fresh fennel
Keep freshly harvested fennel in the refrigerator, wrapped loosely or stored in a bag in the vegetable drawer. Remove any damaged outer layers and use it within a few days for the best crispness. The fronds wilt sooner than the base, so store them separately if you want to keep them fresh.
When you have more than you can use
Use extra fennel in soups, stews or roasted vegetable dishes. The base can be sliced and frozen after blanching, although it will soften when thawed and is best for cooked dishes. Chopped fronds can be frozen in small portions for soups and sauces. Small sowings help you avoid a large glut.
CHAPTER 11
Next Season Starts Now
Fennel is sensitive to timing and moisture, so notes about sowing and bolting can help you improve the next crop.
Keep a tiny garden record
· Variety name and whether it was bolt-resistant
· Date seeds were sown and seedlings appeared
· Whether the crop was direct-sown or transplanted
· How steadily the soil stayed moist in summer
· When the bases reached a useful size
· Whether any plants bolted before harvest
· How you used the bulb and fronds
Saving seed and planning another crop
Florence fennel is usually grown as an annual for its swollen base. If left in the ground, it may bolt, flower and set seed, but seed from cross-pollinated fennel may not grow true to the original variety. Herb fennel and Florence fennel are closely related, so home seed saving can also give unpredictable plants. For reliable bulbs next season, buy fresh seed of a named Florence fennel variety.
1. Choose a healthy plant with a well-formed base.
2. If saving seed as an experiment, leave the plant to flower.
3. Allow the seed heads to mature and dry on the plant.
4. Collect dry seeds before they fall or scatter.
5. Label the variety and year, and store cool and dry.
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GOOD TO KNOW The feathery fronds are edible and have a delicate aniseed flavour. Use them fresh as a garnish or freeze them for cooked dishes. |
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WHAT I WOULD DO I would harvest just before cooking, trim the root end and wash between the layers where soil can collect. |
COME GROW WITH ME
FENNEL CHEAT SHEET
The page to come back to when you have soil on your hands and no time to reread the whole book.
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SOW |
June–early July |
About 1.5 cm deep in warm soil |
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GERMINATE |
Warm, moist seedbed |
Keep evenly moist until seedlings establish |
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POSITION |
Sun and shelter |
Fertile, free-draining soil |
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SPACE |
30 cm for full-size bases |
10–15 cm for mini fennel |
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HARVEST |
Late summer–autumn |
Pick rounded bases before bolting |
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Water |
Keep soil consistently moist. |
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Feed |
Prepare the bed with mature compost. |
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Thin |
Do this gradually and avoid root disturbance. |
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Mulch |
Conserve moisture once plants establish. |
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Harvest |
Cut bases before they elongate. |
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Next season |
Note sowing dates and which plants bolted. |
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HUNGARY IN ONE LINE Sow Florence fennel in warm soil from late June, water steadily through summer and harvest firm bases before autumn cold. |
COME GROW WITH ME • FENNEL
Horticultural reference: RHS, How to grow Florence fennel. Seasonal guidance is adapted for Hungarian home gardens.
