Botanical Garden is a place in Ann Arbor where a wide range of plants are cultivated for educational, exhibition and scientific purposes. This sometimes has a library, greenhouse and arboretum within the garden. An arboretum is a botanical garden dedicated primarily to the growing of woody plants. All the plants in a botanical garden are labeled, with both the common and the scientific names. Within a botanical garden in Ann Arbor one may also find rock gardens, aquatic gardens, desert gardens, and tropical gardens. Botanical gardens are often maintained by universities or other scientific research organizations in Ann Arbor. The main purpose is to maintain standard collection of living plants for the purposes of scientific research, conservation, exhibition and education in Ann Arbor.