Fennel

Fennels in Barnston

Foeniculum vulgare

Fennel is a hardy herb grown for its feathery foliage and aniseed-flavoured seeds, and sometimes for crisp bulbs in specialist varieties. In UK gardens it does best in full sun, in fertile, free-draining soil, and it dislikes being moved once established.

Height150cm
SunlightFull Sun
WaterModerate Water

Growing Guide

Step-by-step instructions for growing Fennel

Planting Calendar

Seed DirectLater
J
F
M
A
M
J
J
A
S
O
N
D
TransplantLater
J
F
M
A
M
J
J
A
S
O
N
D
HarvestNow
J
F
M
A
M
J
J
A
S
O
N
D
MaintenanceNow
J
F
M
A
M
J
J
A
S
O
N
D
  1. Sow Seeds

    2 Apr – 31 May
    every 3 weeks

    Sow seeds thinly around 2nd April - 31st May on the surface of fine seed compost, then cover with a light dusting at most. Keep the compost just moist while they germinate, and sow a fresh batch every 21 days if you want a longer picking period.

  2. Thin Seedlings

    15 May – 29 May

    When seedlings are large enough to handle, thin them so each plant has room to make a strong root. Keep the best seedlings and remove the rest cleanly to avoid crowding from 15th May to 29th May.

  3. Plant Out

    30 Apr – 16 Jun

    Move seedlings to their final position once the roots have filled the modules, then water in thoroughly straight away. Space them apart in full sun and free-draining soil, and use a cloche or fleece if cold weather returns around 30th April - 16th June.

  4. Water and Pinch Out

    23 May – 22 Oct

    Keep plants evenly moist from 23rd May to 22nd October, especially in dry spells, but do not leave the soil soggy. Pinch out the growing tips regularly so the plants stay bushy and are less likely to bolt.

  5. Harvest Foliage and Seed

    24 Jul – 22 Oct

    Pick young leaves from 24th July and keep cutting little and often to encourage more growth. Let some plants flower if you want seed, then collect the ripe heads from 24th July to 22nd October once they turn brown and dry.

Companion Plants

Tap a plant to see why it works (or doesn't) with Fennel.

Plants to avoid

Why companion planting matters

Companion planting can deter pests, improve pollination, and make better use of space. Some plants confuse pests or attract beneficial insects; others improve soil or offer shade to neighbours that need it.

Suggested Varieties

Popular varieties of Fennel to consider

Purpureum

A bronze-leaved fennel grown for foliage colour and ornamental value as well as flavour.

Giant Bronze

A tall, bronze selection with feathery leaves and good garden presence.

Sweet Fennel

A reliable green fennel type grown for leaves and seed in the herb garden.

Also in nearby towns

See how Fennel timing shifts in other towns with different frost dates.