The Idaho Botanical Garden in Boise occupies former Old Idaho State Penitentiary land, where the prison’s farm and nursery operated until 1973, and was established in 1984 on leased prison grounds after years of disuse. Covering 15 acres, it emphasizes plants suited to the Treasure Valley’s sagebrush steppe and combines display gardens, education, and community events. Its landscape preserves visible traces of the prison setting, including old walls and trees planted by inmates in the 1960s. Distinctive gardens highlight native, waterwise, and fire-resistant plants, while spaces such as the Children’s Adventure Garden and seasonal festivals have made it a major gathering place sustained by private support.