With the exception of Semperflorens (Bedding begonias), tuberous begonias (Begonia Tuberhybrida) are probably the type of begonia best-known and most widely-grown and enjoyed by the average gardener around the world. For many years it was thought they were delicate plants that had to be grown in hot-houses. In fact, they may be grown successfully in suitable sites in the open garden, which puts them within the reach of most gardeners.
The tuberous root system of this group enables them to become dormant over the winter period and thus survive (when lifted and stored) and grow again when the weather becomes warmer. This winter dormancy permits a greater range of climate zones in which they may be grown outside.
The development of the tuberous hybrids has brought us considerable variety of form, shape, and color. The following terms describe the flower types found within the group.