The Pretoria National Botanical Garden is one of South Africa's nine National Botanical Gardens. The garden is wedged between Pretoria Road and Cussonia Avenue in Brummeria, in eastern Pretoria, Gauteng, and flanks a central rocky ridge that runs from east to west. The 76 hectares (0.76 km2) garden was established in 1946, and of late hosts the headquarters of the South African National Biodiversity Institute.