Learn to care for and grow Pelargonium sidoides (Rabassam, South African Geranium). Pelargonium sidoides (also known as Rabassam and South African Geranium) is a plant in the family Geraniaceae. It is hardy in zones 9a-10b. It is perennial. The sun requirement is full sun. The soil PH needed is 7.6-7.8.