How to tell if your grass is weeds

First find a nice patch of green questionable looking grass. Next, take a weed killer and spray it on the suspicious looking grass. If the grass turns brown, it was weeds; if it dosen't, well that’s down right surprising...the spray is probably defective.

We tried this out last spring. Most of our lawn was weeds but they’ve grown back now and every thing is green again. We’ve decided to keep the weeds, but at least now we know it’s not grass.