I have a buddy that used to get his crawfish pot and dump a sack of water softener salt and boil it til it dissolved. After it cooled off, he would spray his limestone areas with it. I'm thinking bout giving that a try. I'm having the same problems with weeds sprouting back after a few weeks. Correct me if I'm wrong but the roundup and 2-4D types are systemic herbicides. These just get the ones that are above the ground with the plant visible. The pre-emergence ones are aystemic or sumpin like dat.
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