London's smallest botanic garden sits behind the South London Botanical Institute. It's densely planted with more than 500 labelled species in themed borders. Plants used in pharmaceutical and popular herbal remedies and research can be found in the Medicinal Border. Plants from New Zealand include a rare endangered coastal shrub, a leafless clematis and a rare Sophora tree. British natives, ferns, mosses, scented and drought-tolerant plants and unusual vegetables also feature. A pond supports native wetland plants and provides a habitat for frogs and newts. The Institute building houses a botanical library, lecture room and a herbarium. Home-made teas available at the Garden Café.