Ugh! I had planted mine in the garden, not knowing how bad it spread. Planted in the spring, tryied digging it out about 3 months later when I found out how bad it was. Three plants had spread it's roots out 4 feet wide circle and down over 2 and half feet deep and I was still breaking off roots. I almost never use chemical but have been trying to kill it with chemical for 3 years and not tilling the area and it still is spreading. If I can't get rid of it, my husband will have to use the backhoe to dig it out.