Buy Scabiosa caucasica 'Perfecta Blue' from Sarah Raven: Scabious are classic British garden plants and are invaluable for their hugely long flowering season, good vase life and the bonus that the bees and butterflies love them.
"An all-time favorite perennial. The sweet scent of Lily-of-the-Valley will fill the garden in early spring. Each stem produces as many as 25 blooms. Easy to grow in shady areas, but will also thrive in partial sun." My favorite flower.