My property was infested with Bermuda grass when I moved in 30+ years ago. As my gardening friends said back then: roundup doesn't kill it; it just slows it down a bit. The thing about this noxious weed is that the roots go down FOUR FEET! - and if you miss a piece of root, it grows back. I always say if the landscape fairy granted me one wish, it would be for no grass to ever grow on my property! Some time ago, I pulled carpeting out of a small room, and threw the carpet by my back door to keep down the mud and dust. After 5 years, the carpet was really shot; when I pulled it up, that was the only part of my yard to have no more bermuda...so I proceeded to go to used carpet places and help myself to their carpet that was going to the dump (they were thrilled: it saved them dump fees). Eventually I carpeted almost 1/2 acre and left it down for 5 years, since I know that works. It's not "organic" but it is reusing trash, allows water through, and is the ONLY way I've ever found to get rid of the nightmare. I put the carpet pile down(easier to walk on), and when it's done, it finally does go to the dump. I then put down weed cloth which can last for decades if it is not exposed to sun, which breaks it down. It's easy to weed on top of, or if you get the weeds when they are small, I just spray with the vinegar/soap mix. I use Dawn dish detergent, even though it comes from the evil P&G which I try to avoid.
As an aside, my roses had aphids last month; I sprayed them with soapy water, but apparently used to much dish soap: almost killed the roses!!! So that is clearly an important ingredient.
