Creeping Charlie use borax
After doing some checking I am not sure about using Borax. Please see the information below. I take it that you do not want to use a herbicide. If you have more questions please feel free to call me at 701.667.3340 or email me directly at firstname.lastname@example.org
The problem with borax is that it is too persistent. It doesn’t break down, ever. If too much is used, borax will kill not only the creeping Charlie, but also the grass and other plants in the area. Since borax does not degrade, if too much is used it will poison the earth and nothing will grow in that spot for many, many years. It’s not worth the risk, in my opinion.