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Don't pitch the scapes!
The first time I planted garlic, I cut off the scapes (what this article calls "flower shoots") when they appeared and threw them on the compost heap. A few weeks later I learned they can be used in cooking. Auggghhh! After I dried my tears, I began to look for garlic scape recipes and in the years since have had great fun with scapes (e.g. pesto). If left to mature, the scapes will make the plant think it's successfully reproduced so, as the article states, the bulb will not be as robust as it might. However, it's fun to let one or two mature so you can see the teeny tiny "head" of garlic seeds that will develop.