Crassula perfoliata is an attractive summer-flowering succulent with sickle-shaped leaves and red flowers up to about 0.5 m high. The leaves are greyish green, often with red markings. The older leaves are persistent on the branches. Many small flowers are densely arranged in a rounded to flat-topped inflorescence borne on an elongated peduncle. The bright red or pink to almost white tubular flowers are up to 7 mm long.
Plant in a well-drained soil in a sunny spot. Do not overwater.