I have to disagree John. I think that is very bad advice. I have a black colocasia and it can not be in water or it will die. It likes well drained good soil like you would find in the tropics but not dried out. I keep mine moist but not standing water. Just by the side of the house with the other plants. If you people are having them die I would sugest to go to the nearest cow farmer and bring a bucket of already composted manure home. Mix it half and half with sand and peatmoss and dig a big hole. Plant it to the depth it sais and it should sprout and thrive like crazy. My green ones do great in this also.
Good luck. Tasha
Q