Thick tubered Colocasia esculenta and all Alocasias I let dry out and treat like Caladium (a sister genus). I leave some soil around the clumps I dig up after frost and transport to my basement or leave in pots, this protects from excess drying. Only the runnerlike Colocasia 'Black Magic" I have to supply some moisture to over winter and keep in bright light or it will completely wither away. Bonaventure Magrys NJ USA