Boyce Thompson Arboretum State Park is an Arizona state park located near Phoenix, Arizona in the United States. It consists of a 323 acre (1.3 km²) botanical collection that includes a wide range of habitats and a 1.5 mile (2.4 km) main loop walking trail. Founded in 1925, the arboretum is the largest and oldest botanical garden in the state of Arizona. It is jointly managed by the University of Arizona and Arizona State Parks.
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