Tuberous Begonias (Begonia selections) offer full, double flowers that are available in many colors, including an attractive shade of red. These blooms thrive in shade and require well-drained soil. They are prone to rot, so take care not to overwater them. Tuberous Begonias are typically hardy in Zones 9 – 11, but in colder locations, the tubers can be dug up and saved in a frost-free location, then planted again after the winter has passed.