When confronted, years ago, with thistle plants in our mowed area I found that pouring undiluted vinegar on the center of the plants killed not only the above round portion, but the roots as well. Best when used on dry soil as it becomes the go-to-moisture for the root system. This idea may well be effective with other root systems. You will have a brown spot, but the native grasses eventually filled in the space. Hope this helps.
When confronted, years ago, with thistle plants in our mowed area I found that pouring undiluted vinegar on the center of the plants killed not only the above round portion, but the roots as well. Best when used on dry soil as it becomes the go-to-moisture for the root system. This idea may well be effective with other root systems. You will have a brown spot, but the native grasses eventually filled in the space. Hope this helps.