Please help! This plant was established in a corner of my flowerbed when I moved here, and nothing I have done has been successful at removing it. It is now coming up in other parts of the bed and my yard. Has anyone had success eradicating it? I am thinking about shearing the plants to the ground, covering the entire area in a very thick layer of wet newspaper, and covering that with mulch. How long do you think it would take all the tubers to finally die so that I can reclaim that area? Any help you can provide would be GREATLY appreciated!!!