Leeks are easy to grow and tolerate standing in the field for an extended harvest, which takes place up to 6 months from planting. The soil in which it is grown has to be loose and drained well; leek can be grown in the same regions where onions can be grown. Leeks usually reach maturity in the autumn months. Leeks can be bunched and harvested early when they are about the size of a finger or pencil, or they can be thinned and allowed to grow to a much larger mature size. Hilling leeks can produce better specimens.