Begonia is a perennial flowering plant in the family Begoniaceae. To keep begonias over winter, take them indoors, placing them in a cool, well-ventilated room. Start by withholding water from them and the foliage will die back. In a few weeks time, easily remove the stem and leaves without damage to the tuber. Subsequently remove the tuber from the soil, clean it off, dust it with a complete soil dust and store it on top of dry peat moss until it is ready to be restarted early next year.