Purpureum
A bronze-leaved fennel grown for foliage colour and ornamental value as well as flavour.
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.
150 cm · Full Sun · Moderate Water
Calibrated to Dundee · last frost ≈ 3 May
| Activity | January | February | March | April | May | June | July | August | September | October | November | December |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sow outdoors | No | No | No | Yes | Yes | No | No | No | No | No | No | No |
| Plant out | No | No | No | No | Yes | Yes | Yes | No | No | No | No | No |
| Harvest | No | No | No | No | No | No | Yes | Yes | Yes | Yes | No | No |
What to do through the growing season
01
Sow seeds thinly around 19th April - 17th May on a fine, raked seedbed, then cover with only a light dusting of soil. Keep the soil just moist during germination. Sow a fresh batch every 21 days for a longer picking period.
02
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 3rd May to 14th June.
03
Direct-sown fennel needs no transplanting. Once the seedlings are established, thin them to apart in full sun and free-draining soil, and use a cloche or fleece if cold weather returns around 17th May - 3rd July.
04
Keep plants evenly moist from 17th May to 25th 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.
05
Pick young leaves from 12th July and keep cutting little and often to encourage fresh growth. Leave some plants to flower for seed, then collect ripe heads through 25th October once they turn brown and dry.
Popular varieties of Fennel to consider
A bronze-leaved fennel grown for foliage colour and ornamental value as well as flavour.
A tall, bronze selection with feathery leaves and good garden presence.
A reliable green fennel type grown for leaves and seed in the herb garden.