I've had an unknown plant growing in a pot in a window with a store bought Norfolk Island Pine for about a month now. I decided to let it grow out and couldn't figure out what it was for the life of me, I thought it was mint but the smell was too different.. after seeing the picture in asdf1's link I now know its catnip and its stinky as fuck. I've topped half of her growth and FIM'ed almost the other half and will try LSTing a bit as well as leaving one for a "control". I'll get some pics up and post the results whenever it's done.