Buchu is either of two small flowering shrubs native to South Africa, Agathosma betulina and Agathosma crenulata. The leaves of these two species, which are rich in essential oils, have traditionally been used as an herbal remedy for ailments of the gastrointestinal and urinary tracts. They have also been widely used as a flavoring agent for tea, candy, and alcoholic beverages, especially brandy.