The Botanische Gärten der Friedrich-Wilhelms-Universität Bonn, also known as the Botanischer Garten Bonn, is a botanical garden and arboretum maintained by the University of Bonn. It is located at Meckenheimer Allee 171, Bonn, North Rhine-Westphalia, Germany, and open except Saturdays in the warmer months; admission is free. The gardens were originally castle grounds for the Archbishop of Cologne, dating to about 1340, which circa 1650 were fashioned into a Renaissance garden.