How to Grow Leeks


  • Sowing Instructions (Indoors)
  • How to Transplant
  • Sowing Instructions (Outside)
  • Crop Maintenance
  • How to Harvest
  • Storage
  • Pests & Diseases

Sowing Instructions (Indoors)

  • Leek can be started, early indoors & transplanted in June
  • Sowing Time: Sowing indoors in mid February
  • Sowing Location: 24 cell seed trays, one seed per module

Sowing Instructions (Outdoors)

  • Traditionally, leeks are sown in seed beds
  • Sowing Time: Mid to Late March, once soil is suitably warm
  • Sowing location: Sunny location in seed beds, in open vegetable plot or raised beds
  • Soil: Fertile soil that drains well is preferred
  • Avoid soils that waterlogs or dries out rapidly
  • Leeks prefer alkaline soil, with ph between 6 and 7.5
  • Spread home made compost or manure on the site the previous autumn
  • Create shallow drills 1/2 inch deep
  • Sprinkle seeds thinly along the drill
  • Roughly 1.5 inch apart
  • Close the drill with soil and water well, not forgetting to label
  • The distance between the drills should be 18 inches

How to Transplant

  • Transplanting increases the length of white stem on your leeks
  • The young plants are ready for moving in June when 20cm long
  • Water well before moving, if grown indoors harden off before transplanting
  • Using a dibber, make holes 15cm deep & 15cm apart
  • Insert your leek seedling & fill the hole with water
  • Don't backfill hole with soil & avoid letting soil fall between the leaves

Crop Maintenance

  • Keep well watered as roots can be exposed to sun
  • Weed every second week
  • To increase the length of the white stem you can earth up around the leek's stem
  • Susceptible to the same diseases as other onion plants


  • Pull your leeks as and when you need them
  • Carefully lever the root out with a hand fork


  • Leeks will last for up to a month in your fridge
  • Avoid lifting early, leeks are perfectly fine in the soil until needed
  • Leeks can tolerate moderate frost (-2°C to -5°C)

Pests and Diseases

  • Pests: Bird attack seems to be one of the main problems
  • Damage: Birds pull up roots
  • Protection: Fine netting is draped between twigs for protection
  • Other pests and diseases include: Onion fly, neck rot & bolting

Associated Products