Much like their winged namesake the purple flowers of penstemon 39raven39 soar above the plant39s semi45evergreen foliage on tall spikes for the majority of the season the sweet nectar of these blooms is sure to attract other flying creatures albeit pollinating insects rather than real ravens this shortcoming wasn39t enough to dissuade the rhs from granting the hardy perennial an agm 40award of garden merit41 so shouldn39t put gardeners off giving it a place in sunny