The American Begonia Society is a horticultural society devoted to the promotion, cultivation, and study of begonias (plant family Begoniaceae). Begoniaceae is one of the largest flowering plant families with over 2050 different species and thousands of cultivars. Mature Begonia plant sizes range from a mere few inches high to over 12 feet high. The range of Begonia flowers, foliage colors, and sizes is incredibly diverse and spectacular.