The grass under my tree is disappearing! It's on the north side of my house with a fence and a tree on the west and a tree on the east, plus it's on a slope. The grass started vanishing last year. I thought something was eating it. We put down a shade loving seed mix and it came up ok. This year there are a few baseball size patches and thats it. I had a pest guy come by and he said it was just a shade problem. What kind of grass will grow in the dark and heat? I think the rest of the lawn is buffalo but it's full of weeds (the pest guy's going to spray). Thanks for the help.