One reason I love to plant garlic (In October in the NE US), is that I can use it 3 times during its life-cycle. After planting garlic sprouts. These sprouts (what you might be calling a leaf) can be cut back to ground level before winter and used in cooking...garlicky chive-like flavor and application. Then in the spring, they sprout again. After a while the scape will emerge. The scape is identifiable by a bulge at that top and the stalk is cylindrical, but tends to spiral after a while. Again, the scape can be cut off. These are best sauteed, but have other applications as well. Finally, the mature garlic head can be unearthed, dried/cured and used. Save a head and separate in to cloves for planting again the next fall!