I live in the mountain west, where my neighbor's lawn and the mountains nearby allow Bermuda grass to infiltrate my lawn. My neighbor says the only real solution is Roundup; but I'm sure that's not the case. What can I do to discourage growth of the one grass type while promoting growth of the other?
I've heard of using asphalt shingles as a barrier between grass and flower beds (just dig a trench and bury a line of shingles, may not be pretty but it's effective) and that should stop any more grass from spreading but as for the existing grass you may be forced to either use RoundUp or chop it out and re-seed. I'm not sure of any chemical or other control method that targets Bermuda grass specifically.