The Berlin-Dahlem Botanical Garden and Botanical Museum (German: Botanischer Garten und Botanisches Museum Berlin-Dahlem) is a botanical garden in the German capital city of Berlin, with an area of 43 hectares and around 22,000 different plant species. It was constructed between 1897 and 1910, under the guidance of architect Adolf Engler, in order to present exotic plants returned from German colonies.
The garden is located in the Lichterfelde locality of the borough of Steglitz-Zehlendorf. When it was founded, a part of it was located in Dahlem, a fact that is still reflected in its name. This part of Dahlem became part of Lichterfelde in 1938. Today, the garden is part of the Free University of Berlin. The Botanical Museum (Botanisches Museum), with a large herbarium (Herbarium Berolinense) and a large scientific library, is attached to the garden.
The complex consists of several buildings and glass-houses, such as the Cactus Pavilion and the Pavilion Victoria (which features a collection of orchids, carnivorous plants and giant white water lily Victoria-Seerosen). The total area of all glass-houses is 6,000 m². The garden's open-air areas, sorted by geographical origin, have a total area of 13 hectares. The garden's arboretum is 14 hectares.
The best-known part of the garden is the Great Pavilion (Das Große Tropenhaus). The temperature inside is maintained at 30 °C and air humidity is kept high. Among the many tropical plants it hosts a giant bamboo.