The royal purple flowers of penstemon 39pensham westminster belle39 are truly fit for a king or queen they salute from elegant spikes during june july august september and october providing a princely splash of long45lasting colour the hardy perennial39s semi45evergreen foliage is adept at surviving low temperatures meaning it can reign in the garden almost all year round height 75cm 4023963441 spread 60cm 4023903441