when to plant leeks in the winter
The process for planting winter sown and spring sown leeks (as well as small leek plants bought in garden centres) is exactly the same as described below. However, winter sown leeks will need to be hardened off before planting outside. Winter sown leeks should be ready for transplanting in the first to second weeks of May 2017 whereas spring sown leeks will be ready for transplanting in the first week of June.