Sorry, not an answer, but a related question. Will big clumpers and runners win the battle with grass, even if it's that really nasty vine-like grass that goes and goes?Thanks

I planted 2 varieties of ground cover dwarf bamboo on a sandy hill. The grass grew taller of course. The bamboo (which I was hoping would take over) died out, for (I suppose) lack of sunlight. I have heard that giant bamboo will eventually choke out everything with the small "filiment" roots it puts out, but I have not seen it completely do that in my own garden. My more mature plants do end up with very little vegatation at their base, eventually, but it takes about 3 years to get there.

I would assume whatever is tallest would have the prime advantage. I would think timber bamboo could take out brome over time. Not sure about groundcover bamboo, I thought they prefer shade. It also depends what kind of grass you have. If you have brome or an equally invasive grass its best to kill it off.