Only a short distance from Superior, Arizona, the Boyce Thompson Arboretum is a hidden gem. Development began in the 1920s when mining magnate Col. William Boyce Thompson commenced a collection of plants from the dry areas throughout the world and established them as an arboretum on land adjacent to his Picketpost House. This under-recognized arboretum exists in stunning surroundings of mixed flat land and shaded canyons. This gallery is a work in progress.