Bonn Botanical Garden
Located in Bonn · Website: www.botgart.uni-bonn.de/ · Botanical garden
Wikipedia
The Botanische Gärten der Friedrich-Wilhelms-Universität Bonn (6.5 hectares open to public, 3 hectares private), also known as the Botanischer Garten Bonn, is a botanical garden and arboretum maintained by the University of Bonn.
It is open except Saturdays in the warmer months; admission is free.