I once dug a clump of daylilies and put the clump in the shallows of our pond. That was in the spring or summer of one year. They lived through that winter and all the next growing season in the shallows (the water level in the pond naturally rises and falls over the spring-summer-autumn almost a foot. After the next winter I forgot about them. A few winters later when I remembered them they were completely gone. I think our muskrats eventually found them and had them for lunch
