Dodecatheon jeffryi ‘Rotlicht’ (syn. D. tetrandrum ‘Red Light’) – This seed grown variety of a North American species bears numerous magenta-pink blooms with yellow centres and recurved petals (resembling a cyclamen), usually from May to June. It prefers acidic, evenly moist soils and may go summer dormant during dry periods. Grows 18″ high by 10″ wide. Zone 4.
Campanula medium ‘Champion Pink’ – Canterbury Bells are at best short-lived biennials that often self-seed. ‘Champion Pink’ makes an excellent cut flower and has won a Fleuroselect gold medal in this category. The spires of pink bells are borne from early to late summer but some should be left to go to seed and naturalize. Grows 24″ high by 18″ wide. Hardy to zone 3.
Incarvillea delavayi – The Hardy Gloxinia is a lovely cottage garden perennial that has fallen a bit out of favour, so it can be difficult to find. This native of China produces a rosette of divided mid green leaves and upright stems of numerous trumpet-shaped rose pink blooms with a yellow throat. Consider a winter mulch in colder regions. Grows 18″ high by 12-18″ wide. Zone 6.
Erigeron glaucus ‘Sea Breeze’ – The common name of ‘Beach Fleabane’ hardly does this perennial justice, as it bears masses of fringed-petaled pink daisies (with contrasting yellow eyes) from late spring through to fall. It tolerates drought once established and the greyish-green foliage is also reliably evergreen in mild regions. Grows 8-10″ high by 12-16″ wide. Hardy to zone 5.
Coreopsis rosea ‘Heaven’s Gate’ – This improved form of the old garden standard is a sport of ‘Sweet Dreams’ and produces large (up to 2″) pink daisies with a golden cone surrounded by a magenta ring. Flowering over the fern-like mid green foliage begins in early summer and lasts for many weeks. Requires sharp winter drainage. Grows 12-15″ high by 24″ wide. Zone 5.