I have tried everything I could find, the are flourishing in my front yard, I tried all the weed killers, waste of money, tried salt, forget it, tried battery acid, they love it, tried digging them up, yeah right, was waiting for them to dry out last winter, never did, was going to burn them, that didn't work. Next, I'm, getting a front end loader and scraping the whole yard down to the dirt and burying that stuff. Problem is, you drag them home in your tires and they fall off in your yard and grow like weeds. If you find something that works, let me know. Oh yeah, I tried bleach too, didn't do a thing.