Mark: I have had good luck with similar treatment as you describe. I dig them and let them dry off and place them in supermarket plastic bags with commercial potting soil or seed starting mix and couple of squirts of water. I check once or twice during the winter to make sure they don't desiccate. If the tubers are plump I leave them if they are looking shriveled I add a bit of water. They are stored at about 45 F to 50 F. Very similar to the way I treat dahlia tubers. Of course the trick is to over winter some alocasias or colocasias. Arnold New Jersey