This "weed" came in with a load of topsoil a few years ago. It smells &
tastes like pennyroyal, I just love the stuff. So much that I brought some
with me when I moved to another state. I've been keeping it in a half-barrel
planter, and every year it seems to get worse. The newer growth doesn't seem
so much affected as the first spring shoots, though.

http://webpages.charter.net/slyrp/Pl...20arvensis.JPG