The headquarters garden for Oklahoma Botanical Garden & Arboretum (OBGA) is composed of 100 acres just west of the Oklahoma State University campus in Stillwater. It includes the Oklahoma Gardening studio set, the turf and nursery research centers and Centennial Grove. The Headquarters Garden feature over 1000 species of herbaceous and woody plants. Display gardens include an abundance of annuals and perennials, Water Garden, Rock Garden, Miniature Railroad Garden , Wildscape Garden , Japanese Tea Garden, and 7 to 8 yearly theme gardens.