Centaurea dealbata (Persian cornflower):
Large, showy pink flowers over deeply divided foliage. Makes a good-sized clump in a couple of years. To 60cm. Hardy.
[Collect Only]
Dianthus carthusianorum (German pink):
Tall stems ending in clusters of bright pink flowers above mounds of green, grassy foliage. Prefers sunshine. Hardy. Up to 50cm.
Stachys macrantha 'Rosea' (Betony 'Rosea'):
Upright spikes of pale pink flowers above pointed dark green foliage. The flowers are a bit orchid like in shape. Very attractive to bees. To 50cm. Hardy.