The State Arboretum of Virginia is part of Blandy Experimental Farm, a research field station for the University of Virginia. The Arboretum collection includes a Virginia Native Plant Trail, the largest variety of boxwood cultivars in North America, and more than 6,000 trees and woody shurbs including a third of the world's pine species. The collection emphasizes native trees and woody shrubs and their exotic relatives. It is the only mature arboretum on limestone soils on the east coast. The grounds are open dawn to dusk, 365 days a year, free of charge.