A recently popular way to kill creeping charlie is by dosing it with Borax, but there are problems with this method. First of all, Borax is not a registered herbicide. It lives in the soil for a longer time than most patented herbicides, so it can kill everything in that area for a time, and even make that area permanently barren. I find that young creeping charlie plants in spring are easy to pull, roots and all. If this plant is taking over, stop it now by poisoning it before it is too late. Many people have luck with postemergence broadleaf weed killer containing dicamba. Products containing triclopyr or 2,4-DP may also provide some control. Early autumn is the best time to apply a pre-emergent, but you can apply a postemergent now to give your yard some relief.