chamomile, so pretty and smell heavenly in the herb garden; they're easy to grow from seed and naturalize well if you leave the second batch of flowers (after harvesting for tea, etc) to wilt and go to seed
Linaria purpurea ‘Cannon Went’ or “Pink Toadflax” - Easy to grow! Lovely pink, small, snapdragon-like flowers over thin grayish leaves. To 2' tall. Blooms June-Sept. Reseeds. Sun to part shade. Drought tolerant and deer resistant. Perennial zones 5-10.
‘The Albrighton Rambler’ has small, cup-shaped, perfectly formed flowers of softest pink that pale to blush. The petals are beautifully arranged with a little button eye; the overall appearance being one of exceptional prettiness and charm. The blooms are held in large sprays and hang gracefully on the branch.