Among the various types of begonias, Begonia rex is one of the most beautiful and dramatic plants. Sometimes called painted-leaf begonias or fancy-leaf begonias, these plants are known for their variegated leaves. They frequently have large leaves (up to 6 inches long) that are brightly colored 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 and many growers pinch off blooms to maintain breathtaking leaf displays. If planting outdoors, do so in May after frosts, but plant anytime indoors. These plants have a moderate growth rate, which means they may grow to less than 12 inches in a year.