It is a real pleasure to wander around these attractively landscaped gardens. You will see examples of a wide variety of plants from all five continents - 30,000 different species in total. They are all labeled with their Latin and Spanish names. Among them are medicinal herbs, sweet-smelling plants and flowers, food-bearing plants, and a collection of roses. There is also a greenhouse with tropical, subtropical and desert plants. The gardens have been open since 1791.