 Also, have you noticed over the past few days, more lawns getting a little crunchy and brown? University of Maryland senior lecturer in turf management, yes, that's a real title, Jeff Reinhart, says there are things you can do to keep your lawn healthy. Right around three and a half inches. So the taller you mow that, the more it will kind of keep weeds out, but also the roots will go down deep as well. Reinhart says you should spread out the watering.