Back to the basics of growing garlic. Once you have your heads of garlic in hand, find a sunny and well-drained spot in your garden. Garlic is a heavy feeder so throw a handful of plant tone into each row. (They especially like nitrogen.) Separate the heads into cloves. Each clove will transform into one head. Big cloves make big heads and small cloves make small heads. Toss out the really small ones. Dig a trench deep enough so that when you place a clove at the bottom there will be at least two inches of soil on top of the tips when they are covered. A lot of web sites say plant then 4 to 2 inches deep. Two inches has always worked for me. The cloves should be 4 to 6 inches apart in rows about 8 inches apart.
Do not be surprised if your garlic sends up green shoots this fall. According to experts, this is not suppose to happen and may weaken your clove and diminish its capacity to get big next year. My cloves always sprout each fall and I always harvest very big heads the following summer.