The Hortus Botanicus (botanical garden) is a botanical celebration right in the heart of Leiden. It is the oldest botanical garden in the Netherlands. Plants from all over the world have been carefully cultivated here by experts for more than four centuries.

The Clusius garden is a reconstruction, the 18^th century Orangery with its monumental tub plants, the rare collection of historical trees hundreds of years old, the Japanese, Von Siebold Memorial Garden symbolizing the historical link between East and West, the tropical greenhouses with their world class plant collections, and the central square and Conservatory exhibiting exotic plants from South Africa and southern Europe.