The genus Tanquana occurs in the central part of the Western Cape Province. Like Pleisopilos, they are dotted, but are smooth and lack the keels of that genus. T. hilmarii tends to remain single-bodied, while the other species will form clusters. They blossom in the fall, and the highly scented flowers open during the day and close in the evening. The genus is considered difficult for beginners to grow. They should be watered sparingly in summer when they are dormant and in winter when the new leaves are absorbing the old. They need strong light to look their best. They are propagated by seed.