The Idaho Botanical Garden is a nonprofit botanical garden located on 50acre at 2355 North Old Penitentiary Road, Boise, Idaho, United States. Until 1973 the site served as the Old Idaho State Penitentiary's farm and nursery. After the penitentiary was closed, the land lay dormant for more than a decade, and in 1984 the gardens were first created. The facility is operated by a private, non-profit 501(c)(3) corporation. To help fund the garden, an admission fee is charged for entry.