Lamium amplexicaule, commonly known as henbit. When I was a little kid - always on my grandmother's heels, she called these hen's peck and I asked her why it had that name. She said it was because the tiny blossoms were no bigger than a hen's peck. Made perfect sense to me. LOL! It's a member of the mint family and is edible. It's non-native from Europe and documented growing wild in the Carolinas and Georgia. More info on this little wildflower here - http://namethatplant.net/plantdetail.shtml?plant=792 and an interesting article on its qualities here - http://www.eattheweeds.com/henbit-top-of-the-pecking-order/
@marlboromaam I'm in Ontario,Canada, and we have Lamium here, but they are low growing and the flowers are small and much flatter. Slightly different type, I guess.
@milaniet Thank you, Milanie! Yours is a much better image than mine. =)
@kjarn Thanks, Kathy!
@aikiuser Thanks, Jenn!
@kvphoto Plague? Nah! Thanks, KV!