I put down some "black diamond" mulch in my back yard. Underneath that, the kiddies who lived there before had put down this kind of plastic stuff to keep the grass from growing. Now, since putting down the mulch, I have WILD looking crabby grass growing like crazy in the mulch!
Could my mulch have whacky grass seed mixed into it? What should I do - keep weeding or use a spray weed killer.