The genus Crassula is one of the most diverse succulent genera, varying from tiny moss-like annual plants to 2m tall succulent trees like Crassula ovata. Belonging to the Crassulaceae family, there are more than 300 Crassula species of which approx. 150 are found in southern Africa, where they are widespread but concentrated in the semi-arid winter-rainfall areas. The centre of distribution of this genus is in southern Africa, but they extend beyond Africa into Europe, America, Australia, New Zealand and the southern islands. The name Crassula is the diminutive of the Latin crassus which means thick or fat, referring to the fleshy nature of the genus as a whole. This popular genus offers an extensive array of sizes, growing forms and textures making them perfect for landscaping, rockeries, windowsill plants or to be grown in containers. They can also be grown indoors as house plants. Those that make excellent house plants are the glossy leaf varieties. Crassulas, given a rich, well-drained medium will grow fast and luxuriantly.

Crassula cultrata commonly known as Plakkiebos is a South African endemic species from the Eastern Cape, KwaZulu-Natal Provinces where it can be found growing from Swellendam and Little Karoo to KwaZulu-Natal. It is synonymously known as Crassula cultrata var. typica, Crassula torquata and Globulea cultrata. It grows up to 80 cm tall. This perennial has red margins on the leaves and bears cream flowers.