Opening/Closure Status

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

Spiny bear's britches

Plant Botanical Name: 
Acanthus spinosus
USBG Plant Location: 
National Garden
Full sun to part shade
Plant Soil Type: 
Poor to average, well-drained garden soil
Plant Moisture Requirements: 

Acanthus spinosus is native to the Mediterranean and can tolerate most garden conditions other than poorly drained soils. It can withstand full sun, but may preform best with late afternoon shade. It has showy vertical reddish-purple flower spikes that are held above the foliage, which is an attractive glossy green. Although slow to establish, it can spread by creeping roots if not kept in check.

National Garden Room Location: