Hi Tsuh Yang, Yes, Begonia bolivensis is tuberous. My tuber came from Brent and Becky's a few years ago, it is quite large (maybe 5 inches across) and I just replanted it in a hanging basket outside yesterday. For winter storage in our climate, I wash and dry the tuber off in fall after the plant has died back, and pack it in a plastic ziplock bag. I recommend keeping a watch on it or applying fungicide in case of mold, but so far my tuber hasn't had problems. It is easy to grow outside, but doesn't like our hottest summer days. I think there might be a few strains of it around, the BB strain is an older one, I suspect, but I believe there have been newer introductions from wild collected mate rial, at least out west. Good luck, Ernie D. **************Get trade secrets for amazing burgers. Watch "Cooking with Tyler Florence" on AOL Food. (http://food.aol.com/tyler-florence/…)