I hope I can put this so everyone understands what I'm trying to say. Here goes; I live on a corner lot and I have a neighbor with bermuda grass (yuck!) on one side and my grandmother on the other side. All of our back yards converge as well as my side lot. I've tilled a very large part of my grandmother's back yard for years as a garden. It's slowly gotten smaller as she grew older but this year she asked me to expand it a little. As the garden got smaller over time, the neighbors bermuda crept in and took over. The point of my post is that we didn't actually plant the expanded area and the bermuda is thick as ever. Even with several tillings and roundup applications, this stuff is incredibly tough. We've even used a small area for limb and debris burning but it always comes back thicker than ever. I started to think we were cursed by gypsys or something.