Has anyone successfully killed creeping indigo. I bought a house 9 months ago in South Miami, Florida and it is infested with creeping indigo. The expert at the fertilizer place said to use Weedair64. It seemed to hurt the leaves but nothing happened to the plant. I used Roundup, the ones that "kills the plant, roots and all" and it did not work. The indigo just sends out new branches and fresh green leaves. I have 55,000 sq ft of lawn. too much area to use my jack hammer to dig down through the rock and dig up the root system. Any suggestions? At this point I don't care if I kill all my grass.