Cornflower Centaurea scabiosa purple Organic — Hardy plantGorgeous purple, spherical flowers on long stems. Greater knapweed (Centaurea scabiosa) is an eye catcher in the garden and a fantastic native plant. The organic flowers are edible and easy to take care of. They also bring butterflies and bees to the garden for even more enjoyment. They will flock to this native plant. A decorative border! The flowers bloom beautifully in the summer. After it blooms, cut the plant back to about 5 to 10 cm above the