The genus Crassula contains over 200 species of perennial and evergreen succulent shrubs and sub-shrubs, ranging in size from dwarfs to tree-like plants. They have attractive, fleshy, thick leaves which vary in texture, size and shape across species. Grown extensively for their foliage and their white, red or pink tubular, star or funnel-shaped flowers, Crassula are prized as houseplants. Most species do not tolerate frost, requiring extensive sunlight for optimal growth. They are naturally found in many parts of the world, but most cultivated varieties come from species native to the Eastern Cape of South Africa. The very popular Jade Plant, Crassula ovata, belongs in this genus.