This 28-hectare botanic garden, home to over 16,000 species of cultivated plants, has much to teach us about plant life. It includes a rock garden, where the plants are laid out according to geographical zone, an arboretum, greenhouses, including a winter greenhouse home to lush tropical and equatorial plants and an animal park, etc. The Conservatory is the setting of a science library and one of the world's largest herbariums.