Knautia macedonica

Bees love the scabious (but non-fragrant) flowers. It will continue blooming for as long as I can keep it deadheaded (a project in itself). It does self-sow quite a bit, but unwanted seedlings are easily removed when they're young. Established plants require a bit of effort to remove. My original seeds were labeled 'Melton Pastels' though the deep-pink form tends to be more common than the lighter pink form in my garden.