Immature garlic is sometimes pulled, rather like a scallion, and sold as "green garlic".

http://en.wikipedia.org/wiki/Garlic

Immature garlic is sometimes pulled, rather like a scallion, and sold as "green garlic".When green garlic is allowed to grow past the "scallion" stage, but not permitted to fully mature, it may produce a garlic "round", a bulb like a boiling onion, but not separated into cloves like a mature bulb.