Boyce Thompson Arboretum State Park is a 343-acre (1.4 km2) botanical garden in the Sonoran Desert, located in Superior, Arizona, United States. It is one of the oldest botanical institutions west of the Mississippi River. Boyce Thompson Arboretum State Park, Arizona The Arboretum was founded in 1929 by William Boyce Thompson, a mining magnate and philanthropist. Thompson was a passionate Read more...