I had it in one bed, and the only way I could get rid of it was to remove everything from it, and hand spade it removing all the root system. They have deep roots too. Then let it empty for a while and watch for any new ones coming up, and dig those out. After I replanted it, some still came up, but I dug those out right away too. Now it's gone from that area. It's a big task. I didn't want to use chemicals, because I didn't want it to affect the other plants near there.
