I agree that the tuber more than likely rotted due to the wet, cold winter. I'm in Florida, on the coast, zone 9b and a few years back we had two consecutive crazy, wet and cold winters .... with ice! I've never seen anything like it in the almost 48 years I've been in Florida. I lost many tropicals those years. I do recall a winter in the 80's when we went to Miami for Christmas to visit family and there was a freak freeze in the northern half of the state and I lost some decent sized cactus plants that I'd grown from seed. Cactus can usually take cold temps but it was just too wet and cold for three days so they all turned to mush. I keep saying I want to move farther south and in a couple more years when my husband decides to finally hang up his professors hat and quit teaching we are going to move a bit farther south to be closer to my sister and her husband ... but who knows, the way the weather seems to be changing I might be wanting to move to the islands by then.
