This essential oil is steam distilled from the dried leaves of Barosma Betulina, a herb which grows wild and abundantly in South Africa. Tinctures, oleoresins and other extracts are produced for pharmaceutical purposes. Only a small fraction of the total amount of harvested buchu leaves are used for distillation of essential oil.
Arctander, Steffen . Perfume and Flavor Materials of Natural Origin (p. 128).