The problem with wood shavings, is that they take up nitrogen when they decompose. Also hold moisture. I wouldn't use them. The best thing that works here, and I couldn't garden with out it due to quack grass, is Grass B Gon. Spray it on the grass, and it dies. Doesn't bother irises, or day lilies, or peonies. The grass dies slowly, but does die. It won't kill broad leafed weeds though. I hear that it works on Bermuda grass too. Lucky for me we don't have that here, but you probably do have it in Kentucky, and I hear that it's hard to control.
