The best weed killer I found is Round-Up. In TN I would mix it according to directions. Put it in a hand held spray bottle using "stream". Hit the weed in the growing center where it will do the most damage. One good squirt usually did it. Canada thistles were the worst up there. If you use "stream" it wont hit the grass around the weed. Sometimes there would be a weed that necessitated making the mix stronger than recommended. I can't recall anything Round-Up couldn't kill. It may take as long as 5 days but they died, root and all.
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