Pelargonium rapaceum has a wide distribution in South Africa keeping mostly to the western and southern parts of the country. The plants occur from the dry Richtersveld desert in the Northern Cape Province all the way south to the higher rainfall areas of the south-western Cape, and from there eastwards into the Eastern Cape Province.
Pelargonium rapaceum has a turnip-like underground tuber which can partly protrude on top of the soil with age. The plants are winter growing. The tuber is protected from dessication in the dry summer months with protective scaly bark (periderm) around the body.
The cultivation of Pelargonium rapaceum is not difficult and the plants can grow in a variety of soils. Propagation is from seed.