Centaurea cyanus Small double flowers ranging in color from deep maroon to black, and 3–4 foot stalks, make Witching Hour a perfectly unique addition to your landscape. This summer blooming variety makes a great cut-flower selection while attracting beneficials and hummingbirds. Blooms are edible, great for adding a dramatic flair to salads, desserts, or drinks! Make your garden a little spookier with this extra dark cornflower. Germination code: (1) or (4)