Hi Leif
I have only just seen this post so it is a bit late in the year now, but my understanding is that you grow the young leek to about pencil size in modules or pots in a cold frame then when transplanting you separate each leek from the compost. I was not sure from your post if you just grow the leeks on the soil surface which i’ve never seen done. I prepare the leek bed and use a dibber or similar to drill a hole 6 to 9 inches deep at about 6 inch centres. Drop the young leek in the hole and leave it. Many gardeners trim the roots of the baby leek so that drops right down to the bottom. do not backfill the hole. over time the leek will grow and expand to the sides of the hole and will be blanched to the depth of the hole. That way you don’t get as much grit in the layers of the leek. All I do then is spray the area with a watering can to saturate the roots. Many gardeners also earth up around them but i don’t bother as you say the green bit is tasty as well. I had a great crop last year and have done the same this year. Cant wait for autumn mmmmmm
