Opening/Closure Status

The grounds of the USBG will be closed September 18, 2021. On other days, 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 for updates on operating status. USBG resources can be accessed online, including educational materials, virtual tours, and online programs by visiting

Winkler’s gaillardia

Winkler’s gaillardia (Gaillardia aestivalisvar. Winkleri)
Plant Botanical Name: 
Gaillardia aestivalis
Plant Sub Species or Variety: 
var. winkleri

Known commonly as Winkler's gaillardia, these plants are found in only one county in eastern Texas. This endangered species is extremely well-adapted to the dry conditions of its native habitat, the sandhills of the east Texas pineywoods, and could prove to be a wonderful garden plant. Development and fire suppression have threatened the survival of this endemic and rare species. Currently there are efforts to protect remaining habitat and to study the effects of periodic controlled burning on threatened plant populations there.