Rex begonias are semi-tropical perennial plant normally grown as an outdoor container plant or houseplant. Among the various types of begonias, rex begonias are one of the most beautiful and stunning plants. Sometimes called painted-leaf begonias or fancy-leaf begonias, these plants are known for their showy, sometimes jaw-dropping leaf coloration. They frequently have large leaves (up to 6" long) that are brightly coloured in various shades of green, red, silver, and even purple. These plants are grown almost exclusively for their foliage, their blooms tend to be small and less showy, so many growers pinch off blooms to maintain breathtaking leaf displays. Some types of rex begonias go into dormancy during the winter.