Hey there all! I was just over in the Dahlia forum and someone had written that when they dug up one of their Dahlias it had sunk into the ground deeper than it was planted. This is my first year growing Canna. When I dig them up in the Fall, will I have to dig down further than I planted? I know it's a bit early, but if I don't ask now...I just might forget! If they do sink down deeper, how much deeper should I dig? Thanks, Deborah.