Mammoth
A tall, leafy dill with good flavour for salads, fish and pickling.
When to plant Dill in London
Anethum graveolens
A quick annual herb for light, feathery leaves. It grows best from spring to mid-summer in a sunny, sheltered spot with free-draining soil. It dislikes root disturbance.
80 cm · Full Sun · Moderate Water
Calibrated to London · last frost ≈ 4 Apr
| Activity | January | February | March | April | May | June | July | August | September | October | November | December |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sow outdoors | No | No | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | No |
| Harvest | No | No | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No |
Growing guide
What to do through the growing season
01
Sow seeds
14 Mar to 12 Aug Optional · repeat every 3 weeksSow thinly around 14th March - 12th August, cover . Sow a fresh batch every 21 days.
- Slugs go for seedlings. Hand-pick or use a barrier.
- Fleece helps the first sowing if the soil is still cold. Take it off once seedlings are growing.
02
Thin seedlings
24 Mar to 2 Sept Dates as each sowing reaches this stageAfter each sowing, thin to . Snip extras at soil level. Do not transplant.
03
Water in dry spells
14 Mar to 10 Nov Dates as each sowing reaches this stageAfter each sowing, water in dry spells from 14th March through 10th November. Dry spells can encourage bolting.
04
Pinch out tips
11 Apr to 10 Nov Dates as each sowing reaches this stageAfter each sowing, pinch tips from 11th April if you want leaves. Take flower stems as they appear.
05
Harvest leaves
25 Apr to 10 Nov Dates as each sowing reaches this stageAfter each sowing, start cutting from 25th April. Leave about one-third of the plant. Keep picking through 10th November.
- Leave one plant to flower if you want seed heads.
Companion plants
Tap a plant to see why it works (or doesn't) with Dill.
Good companions
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 Dill to consider
Fernleaf
A compact, slow-bolting type that suits pots and small gardens.
Tetra
A reliable, later-flowering cultivar with plenty of foliage.
Related plants
Explore similar plants you might like
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Sow indoors January to February, plant out April to May, harvest June to November. Frost risk November to April.
Sweetcorn
Sow indoors February to March, plant out April, harvest July. Frost risk November to April.
Dill guides by town
See how Dill timing shifts in other towns with different frost dates.