Leeks in Gansclet

Allium ampeloprasum var. porrum

Leek
Leek · Allium ampeloprasum var. porrum

A hardy allium for the UK garden, best started under cover and planted out into firm, fertile soil. Keep the rows weed-free, water well in dry spells, and lift stems as you need them from autumn through winter and into spring.

45 cm · Full Sun · Moderate Water

Calibrated to Gansclet · last frost ≈ 28 May

Sow indoors February to April, plant out May to June, harvest November to February. Frost risk October to May.
ActivityJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember
Sow indoorsNoYesYesYesNoNoNoNoNoNoNoNo
Plant outNoNoNoNoYesYesNoNoNoNoNoNo
HarvestYesYesNoNoNoNoNoNoNoNoYesYes

Growing guide

Step-by-step instructions for growing Leek

  1. 01

    Prepare the Bed

    13 Apr to 28 Apr

    Dig the bed well and work in compost before planting time. Leeks do best in moisture-retentive but free-draining soil, and a loose, stone-free tilth helps the stems grow straight around 13th April - 28th April.

  2. 02

    Sow Seeds Under Cover

    27 Feb to 28 Apr

    Sow seeds thinly in modules or a seed tray around 27th February - 28th April, about deep. Keep them at and water gently so the compost stays moist but not sodden.

  3. 03

    Prick Out Seedlings

    19 Apr to 3 May

    Move seedlings on when they are large enough to handle, from 19th April. Pot them into small modules or deeper trays so the roots can develop without crowding.

  4. 04

    Harden Off

    14 May to 28 May

    Set plants outside for a few hours a day before planting out. Do this over 14th May - 28th May so they adjust to wind, sun and cooler nights without checking growth.

  5. 05

    Plant Out

    14 May to 27 Jun

    Plant sturdy seedlings into deep dibbed holes around 14th May - 27th June, leaving just the base of the leaves at soil level. Water in thoroughly at once, then let the soil settle naturally around the roots rather than firming hard.

  6. 06

    Weed and Earth Up

    5 Jun to 4 Oct

    Keep the rows weed-free and draw soil up around the stems as they thicken. Start from 5th June and repeat as the plants grow, keeping moisture steady in dry spells so the stems stay tender and pale.

  7. 07

    Harvest Leeks

    2 Nov to 1 Feb

    Lift leeks from 2nd November once the stems are a usable size, then keep picking through 1st February. Use a fork to loosen the soil before pulling, and take what you need rather than clearing the bed at once.

Companion plants

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

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 Leek to consider

Musselburgh

A reliable open-pollinated leek with long, sturdy stems and good winter hardiness.

Lyon

A traditional variety that gives long white shanks and dependable flavour.

Bandit

A hardy winter leek that stands well and crops for a long period.

Below Zero

A very cold-tolerant leek suited to late cropping and winter harvests.

Leek guides by town

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