April 21st, Lisse. Keukenhof is also known as the Garden of Europe one of the world's largest flower gardens and is situated in Lisse, The Netherlands. The theme for Keukenhof 2018 is "Romance in Flowers". The park houses many early flowering species and the Willem-Alexander pavilion is already showing over 500 varieties of flowering tulip. Keukenhof is the place to enjoy millions of flowering tulips, daffodils and other bulb flowers this spring. By the time it closes on 13 May 2018, the flower exhibition will have received over one million visitors from across the globe.