I've been growing voodoo lily (Amorphophallus konjac) for a few years now, getting my first tiny tubers from my friend Mike. I've got a few planted in the ground next to the pond (not the best spot for them) but most of them grow in pots. It's strange that I can say "most of them" because I really only had one potted plant until last summer when Mike decided he was tired of growing these and gave a few more to me.
Although cold-hardy to zone 6 when in the ground, I move the potted specimens into the garage when the autumn cold kills the foliage, then just let the soil dry out. The dead stem shrivels and dies at some time during the winter, leaving a hole in the ground that enables you to peek in and see the tuber -- I just leave them there all winter, until I dig them out in the spring.