Venkel

Foeniculum vulgare

Engels: Fennel

herbApiaceaeEetbaar

Venkel (Foeniculum vulgare) is a edible herb from the Apiaceae family that grows up to 200cm tall. This plant thrives in full sun and requires moderate maintenance. Blooms in summer with yellow flowers and attracts bees and butterflies.

Hoogte

100–200 cm

Breedte

40–60 cm

Zonligging

full sun

Waterbehoefte

moderate

Grondsoort

loam, chalky soil

Onderhoud

moderate maintenance

Bloeitijd

summer

Bloemkleuren

yellow

Ecologische waarde

Trekt bijen aan

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Verzorgingskalender

Taak	Jan	Feb	Mrt	Apr	Mei	Jun	Jul	Aug	Sep	Okt	Nov	Dec
🌱Planten
✂️Snoeien
💧Bemesten
🍎Oogsten

Care tips

Planting

Fennel thrives in full sun and needs a warm, sheltered spot to develop its best flavour. Choose a position that receives at least six hours of direct sunlight daily. The soil should be free-draining and fertile; loam or chalky soils are ideal. Avoid heavy clay that stays waterlogged, as fennel dislikes wet feet and may rot. Before planting, dig in well-rotted compost or garden manure to improve soil structure and fertility, especially on lighter soils. Sow fennel directly outdoors from April through June, once the risk of hard frost has passed and soil temperatures reach around 10°C. Fennel develops a long taproot and resents transplanting, so direct sowing is strongly preferred. Sow seeds thinly in drills about 1.5 cm deep, in rows spaced 50 cm apart. Water the drills gently before sowing if the soil is dry. Germination typically takes 10–14 days. Once seedlings are large enough to handle, thin them progressively to a final spacing of 50 cm between plants. This generous spacing allows each plant to develop a full rosette of feathery foliage and, if you're growing Florence fennel for bulbs, room for the swollen stem bases to form properly. After thinning, water the young plants in well and keep the soil evenly moist until they're established. A light mulch of garden compost around the base helps retain moisture and suppress weeds, but keep it clear of the stems to prevent rot. Fennel is hardy to zone 5, but young plants benefit from protection if late frosts threaten in April or early May.

Pruning

Fennel doesn't require heavy pruning in the traditional sense, but it does benefit from regular attention to keep it productive and tidy. The main pruning task takes place in October, after the plant has flowered and set seed. Cut back the tall, hollow stems to ground level once the foliage has died back naturally. This autumn tidy-up prevents the old stems from becoming tatty over winter and reduces the risk of fungal diseases taking hold in dead tissue. Use clean, sharp secateurs or a pruning saw for thicker stems. If you're growing fennel primarily for its feathery leaves rather than seed, remove flower heads as soon as they appear throughout the summer. This prevents the plant from diverting energy into seed production and encourages a longer harvest of fresh foliage. Simply snip off the emerging flower stalks at the base where they join the main stem. If you want to collect seed for cooking or sowing, allow a few flower heads to mature fully, then cut them in late summer or early autumn when the seeds turn brown and aromatic. Fennel self-seeds enthusiastically if left unchecked, so deadheading spent flowers is essential unless you want seedlings popping up everywhere the following year. In spring, as new growth emerges, remove any damaged or frost-blackened shoots to make way for healthy foliage. Perennial fennel can become congested after a few years; if clumps look tired or overcrowded, lift and divide them in early spring, replanting only the vigorous outer sections.

Maintenance

Fennel has moderate water needs and performs best with consistent moisture, especially during dry spells in summer. Water deeply once or twice a week rather than little and often, encouraging roots to grow down into the soil. In prolonged dry weather, increase watering frequency; stressed plants may bolt prematurely or develop bitter-tasting foliage. Reduce watering in autumn as growth slows, and avoid waterlogging over winter. Feed fennel once in April as new growth begins. Apply a balanced general-purpose fertiliser or scatter a handful of blood, fish and bone around the base of each plant, then water in well. Avoid high-nitrogen feeds later in the season, as these promote soft, leafy growth at the expense of flavour and hardiness. A spring mulch of garden compost or well-rotted manure provides slow-release nutrients and helps retain soil moisture through summer. Fennel is generally trouble-free, but aphids can cluster on young shoots and flower heads in warm weather. Squash small infestations by hand or spray with an organic insecticidal soap. Slugs occasionally nibble seedlings; protect young plants with grit or organic slug pellets. Powdery mildew may appear on foliage in dry summers; improve air circulation by thinning congested growth and water at the base rather than overhead. Established fennel is fully hardy in zones 5–10 and needs no winter protection in temperate Europe. The crown survives frosts and reshoot reliably in spring. Mulch around the base in late autumn to insulate roots in colder gardens, but avoid smothering the crown itself.