Two of these have been growing for years in a rockery in the parking lot of the University of Washington Arboretum's visitor center. They...Read More seem to be doing just fine and have survived several wet, cold, harsh winters recently, suggesting that they are at least a zone hardier than what is listed in this profile - probably hardy to Zone 8a at least with good drainage. Very attractive and tough plants.
Two of these have been growing for years in a rockery in the parking lot of the University of Washington Arboretum's visitor center. They...Read More