That's simply the next step in the plant's life cycle, however, it's also a sign that the head of garlic is past its prime.

If a recipe calls for a clove of garlic, make sure you're not using the whole head. Garlic is an edible bulb from the lily family and its pungent flavor is a staple ingredient in many cuisines and ...

Head of black garlic cut in half showing black cloves inside, with several whole garlic heads next to it - Ma-no/Getty Images ...