Plectranthus is a member of the Coleus family; a few have a caudex, such as Plectranthus ernstii which comes from South-Africa and was discovered in 1982 by Ernst van Jaarsveld. There are about 350 species of Plectranthus coming from Madagacar, South-Africa, Indonesia and India, so roughly the countries around the Indian Ocean. They are very easy plants to grow and can take a wide varieties of temperatures; some are even hardy. The ernestii, however, is not, but can take low temperatures as long as they do not drop below 0°C.
The ernestii is very easy to propagate by cuttings. It does produces seed, one seed per flower, but as it is so easy to propagate by cuttings, I have not tried to sow them. Cuttings will always produce a tuber which will, with age, thicken up. Depending on the conditions the plant is grown in, the leaves will either be large or small. Cooler temperatures will result in a more compact plant with smaller leaves. It can be grown in full sun or shade.

Plectranthus ernstii

Plectranthus ernstii