Crassula arborescens is commonly found in cultivation by the typical form of ssp arborescens, with thick rounded leaves that have earned it the common name of silver dollar jade. It is found in the southern parts of the Klein Winterhoek Mountains.
Crassula arborescens subs. undulatifolia is a relatively commonly sold plant at garden outlet nurseries, and can make a nice low succulent shrublet in the garden. It does well in containers, and makes a good houseplant. It is widely grown and not difficult to cultivate and thrive with bright light and ample airflow. It can be shaped to create spectacular bonsai forms. This plant was introduced in Europe and described by Dr. B.K Boom in the Dutch journal Succulenta in 1963 and again in Succulenta 59 (6), 1980, as Crassula portulacea 'Blauwe Vogel' (which translates to "blue bird") and was long thought to be a hybrid of Crassula ovata and Crassula arborescens, but it is the same as Crassula arborescens ssp. undulatifolia, a name validly published by Toelken in 1974. Crassula ’Blue Bird’ is a synonym.