Crassula perfoliata var. falcata (The 'Propeller Plant' or 'Airplane plant') make a lovely clump/low growing shrub, that usually grows less than 60 cm tall (but some sources say 1.2 m of height). It has very peculiar grey-green sickle-shaped leaves that are arranged in overlapping pairs along a usually unbranched stem. Tiny scarlet red flowers are massed together in very showy dense clusters that rise above foliage in mid summer. The flowers open slowly and last for nearly a month when in full bloom. Another common name used for this plant is Scarlet Paintbrush, refering to the beautiful flowers.