Genus of about 150 species of annual and perennial succulents and evergreen, succulent shrubs and subshrubs, ranging from dwarf to tall, tree-like plants, and found in dry to moist, high to low areas in Africa, Madagascar, and Asia. There are no typical foliage or growth characteristics to help you identify a plant is a Crassula. Leaves range from scale-like to several inches long, growth habit from sprawling to stiffly erect and leaf colour from grey to red. One of the most popular is Crassula argentea with its tree-like trunk growing 3 ft or more. C. arborescens is rather similar, but the leaves are less rounded and are greyish colour. Do not let temperatures drop below 45 degrees. If repotting is necessary do it as new growth commences. Allow the soil to become quite dry after repotting.