Classic cornflowers, also known as bachelor’s buttons. Deep blue. Upright plants produce abundant double and semidouble, 1–1 1/2″ blooms. Prefers cool temperatures. Edible Flowers: Use the petals of this great edible flower for decorating desserts. Centaurea is also a popular choice for brightening up salad mix. Flavor is bland and mildly floral. Ht. 30-38″. Sun.