25,000 plants, belonging to 6,500 kinds from 77 plant families – all of them are domiciled in the Zurich Succulent Plant Collection. The cactus is well known to everyone – however, many more plants like aloe and agaves can be found in the Zurich Succulent Plant Collection. Succulent plants are able to retain water. They grow in semi-deserts, steppes and rocks in the mountains. In the Succulent Plant Collection, the plants are grown in seven green houses, 16 cold frames and a stone garden for the perennial plants. Visitors consider the collection as a ‘living museum’, which is open every day and where the admission is free.  However, the Succulent Plant Collection also offers great opportunities for scientists: the museum takes part in the international seed exchange between about 200 botanical gardens.