The glorious royal purple bell45shaped flowers of penstemon 39pensham westminster belle39 make a sumptuous and remarkably long45lasting summer display in flower tirelessly from june to september 39pensham westminster belle39 attracts a constant steam of bees with its nectar45rich blooms bred to withstand lower temperatures and changeable summer weather pensham penstemons perform particularly well in uk gardens these semi45evergreen hardy perennials are ideal for ad