Follow the cultural recommendations for other onions. The Welsh Onion, Allium fistulosum , never forms rounded bulbs but only white scallions often used in Oriental dishes. In Japan, it is often incorrectly called the Japanese leek. Follow cultural instructions for green onions. Leeks Leeks, Allium ameloprasum , are grown for the enlarged leaf bases at the bottom of the thick stem.
Leek flavor is mild and is used as a green onion since no bulbs are formed.
Cut off the seedling tops when they are 8 inches tall and transplant them 5 inches apart in the garden. Mounding the soil up several inches around the plants will produce a larger, white, tender leaf base. Leeks can be harvested any time from green onion size to before killing frost. Garlic Garlic, Allium sativum , requiring a long growing season, often does not grow well in midwestern gardens. Garlic produces a group of cloves that are encased in a sheath.