The collections of the Botanical Garden include over 5,500 plant types from around the world. They are used actively in education, outreach and research at the museum. The plants are both grown in green houses and in different thematic gardens outside. The Botanical Garden conveys knowledge about the diversity of the plant kingdom and the importance of conserving it. Norwegian plants that are considered threatened and vulnerable are also kept in the garden. The Botanical Garden serves as an important recreational area in Oslo.