Set pencil-thick transplants 4 to 6 inches apart in rows that are 12 to 18 inches apart. More space pe plant results in fatter leeks, and less space produces thinner ones. Use a dibble or broom handle to make holes that are 6 inches deep, and place one transplant in each hole. Water them in to settle soil around the roots, but don't fill the holes with soil. Let that happen naturally over the season.
Leeks are palatable without blanching, but blanched shanks have better flavor.
A week after transplanting and again halfway through their growing season, give the leeks a nitrogen boost with manure tea or fish emulsion. Throughout the growing season, keep plants well watered. Get the weeds when they're small, and you'll avoid damaging the shallow-rooted leeks in the process of uprooting large weeds. Harvesting Leeks are ready to harvest whenever they are large enough for your taste. Most leeks can be harvested for use as baby leeks, but some varieties are bred for culinary appeal as baby leeks.