I'm in Virginia, Zone 8a, and my back yard is plagued with tall fescue weed. I've managed to kill most of the Bermuda and zoysia grass with cardboard and mulch, but the fescue grows right through it. I can't get away with solarization when it gets hot because my neighbors would complain to the HOA and besides, I don't want to mow it twice a week for the next several months... when it rains, it grows practically overnight.
I'm thinking of using Roundup (the ready-to-use one with 1% glyphosate isopropryl, 2% perlagonic acid & related fatty acids, and imazapic ammonia salt 0.017%) but the instructions say not to plant for four months. If I only spray it away from the native plant and vegetable beds, and only when there is very little wind, would that be okay?
The roots of the fescue seem to be over two feet deep, and I have heavy clay, so digging it up isn't going to work. Thanks.