Leek Seeds

How To Grow

Sowing seed outdoors:

  • Plant seeds outdoors until May in rich/fertile soil (e.g. use compost and ensure location drains well) in sunny location

  • Create shallow drill row 1.5 cm deep with seeds approx 5 cm apart

  • If sowing more than one row, ensure rows are 45 cm apart

  • Cover the seeds with soil and gently water

  • Weed every second week

Transplanting (moving to different location for optimum growing)

  • When plants are approx 2 months in the soil (and are approx. 20cm long) recommended to transplant (move in order to lengthen the white/edible section of the leek)

  • Water well the few days before they are transplanted

  • Again in rich/fertile soil, make a 15cm deep x 5cm wide hole and place leek in. Allow approx. 22 cm between plants.

  • Fill hole with water and do not fill soil into hole - this will naturally occur over time. 

  • Ensure young plant is well watered. If weather is dry water the soil around the plant once a week (not the plant itself). 

  • Approx. 3- 4 months post planting, as the plant increases in height out of the soil, add approx. 5cm dry soil on all sides to surround the plant in a process called “earthing up”, preventing sunlight accessing the lower part of the leek, resulting in more of the edible white part at the bottom of the leek growing. Earth up twice during the plant’s growing season. Be careful to avoid getting soil inside leek leaves whilst earthing up, as will be difficult to get out once harvested. 

  • Smaller leeks have better flavour, so don’t let grow too big.Ensure soil around plant is kept weed free (weed every two weeks), making sure not to damage leek roots when weeding. 

  • To encourage growth and deter pests, feed every 3 - 4 weeks with organic fertiliser (e.g. dried seaweed fertiliser, sachets available on sow.ie)

Growing Time: 

  • Approx. 6 – 7 months


  • Avoid letting grow too big – leeks smaller in size have better flavour 

  • Lift from ground with shovel

Tip: Don't grow leeks in the same place year after year as there will be an increased risk of disease

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