my experience from working with Quail Unlimited when trying to get a stand of native grasses started is to mow the area mid summer and when you get a good rain and things start growing back up, hit it with Round Up. Give it a few days to die back. Then disc the dead plants under. Give it another month, should be early fall by now. Then apply another dose of Round Up. Wait for it to die and then disc it under. Come spring new growth will come back, again hit it with Round Up. The three treatments of Round Up kill off most weed seeds that were dormant in the soil. After that you plant your native grasses in the spring. Set mower height to 4" and mow at least twice during the summer growing season. The following year you can begin a burn regiment to prevent woody vegetation from moving in...
