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.
Gaura lindheimeri 'The Bride':
Beautiful airy stems of white flowers in mid to late summer. Best in full sun, in well drained soil and a sheltered spot. Stems up to 1m.