A supremely useful cut flower. Sprays of clear blue flowers on long, sturdy stems cover bushy plants all summer long. Grow in sun or partial shade. Flowers have a long vase life and should be cut when ½ the flowers on a stem are open. Bees and butterflies flock to these flowers. For weeks each summer, our seed crop planting is a haze of blue emanating a buzzing and humming sound. Annual.