those are probably the scapes. Search youtube for harvesting garlic, there's a few ways but one you can cut off the scape and then wait till the plant dries out, then you should be able to harvest.
Well, I rushed out this morning only to find the stalks had straightened up and the scapes had bloomed the usual flower - all but one. I brought it in but the stem is too hard. Am I supposed to put the seeded pod in my pesto? Haven't tasted anything yet but it sure smells good.
http://www.youtube.com/watch?v=M-MX1jRcJbU