|The cultivar, 'Emperor William' one of the Boy Series is a vigorous cultivar bearing silvery-green foliage and lapis-blue flowers. An easily seeded annual with grey-green foilage and blue, pink, burgandy, or white 1 inch flowerheads. Blue is the favorite and often used in boutonnieres.
C. cyanus have plants that are attractive to bees and butterflies, and are good cut flowers. Sow seeds late summer or early fall in milder climates or early spring in colder climates. Plants will do better if lime is added to the soil, especially in acidic areas.