A close relative of the onion, garlic (Allium sativum) is an edible, bulbous plant that has been cultivated for several thousand years. It is more popular today than ever and, with over 600 sub-varieties available, there is ample room for gourmet garlic growers to carve out a niche. For the home gardener, it is quite easy to grow a year's supply, and you can give your leftover crop to friends and neighbors. A. sativum forms long, narrow flat leaves, white flowers on a tall stalk and an edible, stongly scented bulb divided into bulbets or cloves, contained in a whitish skin.