optimal soil temperature for tuberous begonias
Ideal growing temperatures for Begonias grown indoors are 65Â° to 70Â° F. during the day and 50Â° to 65Â° at night. As is the case with any house plants, always avoid hot and cold drafts! Begonias should be grown in partial sun or light shade and planted in a sandy soil mix that contains added peat moss and compost.