The Pretoria National Botanical Garden, founded in 1946, is home to the Head Office of SANBI. A 50 m high quartzite outcrop divides the Garden in two sections. Its frosty south-facing section and the north-facing, warmer section present two different worlds to the visitor and botanist. Paved nature trails give access to the fascinating natural vegetation on the ridge. Fifty hectares of the total area are devoted to developed garden, using almost exclusively South African plants. All the flowering plant species to be seen including 50% of the country's tree species, make this Garden a botanical tapestry, offering the visitor a glimpse of different biomes such as savannah, forest, fynbos and some plants of other biomes.