Star plants in my part of the world that flower and flower and then flower all over again are Knautia macedonica ( a bold deep crimson , but with the delicate growth habit that fits Pauline 's brief ) , a beautiful refined pale daisy Erigeron ' Quakeress ' and shade tolerant Astrantia major ( best bone-white forms , if you can get them are ' Shaggy ' and ' Moira Reed ' ) .