The Netherlands has almost all the largest flower gardens in the world. Such a Keukenhof. It is the largest flower garden in the world. It is called "Kitchen Garden" or "Garden of Europe". Launched in the fifteenth century, the garden now has about 60 acres of land. More than 6 million tulips are produced from this garden every year. The garden is usually open to visitors during the summer months, from mid-March to mid-May.