All outdoor gardens are currently open. The Conservatory and public restrooms remain closed, due to the closure of the U.S. Capitol campus buildings. Please monitor www.USBG.gov for updates on operating status. USBG resources can be accessed online, including educational materials, virtual tours, and online programs by visiting www.USBG.gov/AtHome.
Hibiscus brackenridgei, the state flower of Hawaii, is an endangered plant endemic to the Hawaiian islands. Unfortunately, there are less than 60 plants in eight populations on the islands of Lanai, Maui, and Hawaii, which are protected by the Endangered Species Act. Threats that include development, overgrazing by livestock and feral animals, as well as competition from invasive weeds have contributed to the drastic reduction in wild populations. Measures being taken by conservationists and botanic gardens to protect the few remaining populations of Hibiscus brackenridgei include weed control, fencing to exclude animals, preservation of remaining intact habitat and conservation of plants and seeds in botanical gardens and seed banks.