Use Mizzou Botanic Garden and Arboretum on first reference. The botanic garden is acceptable on second reference.
The Mizzou Botanic Garden and Arboretum is the University of Missouri’s outdoor campus. It is comprised of numerous themed gardens and beds featuring both ornamental and native trees, shrubs, flowers and grasses. The Mizzou Botanic Garden & Arboretum is maintained by Landscape Services.