i dont agree calling it weed is entirely correct either....

A weed is a plant that is considered to be a nuisance in a garden or other agricultural development. Some weeds are edible, and their leaves and roots may be utilized for food or herbal medicine. It is typically necessary for a plant to grow easily and spread persistently to be considered a weed, because plants which need to be carefully nurtured are easily removed.

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

dunno about u but i don't view it as a nuisance, nor do i think it "easy" to grow and spread.