Here is the Bachelor's Buttons Flower Blue, Centaurea cyanus. This Variety of Bachelor's Buttons Flower is a native of Europe and is also known as Cornflower. There over a dozen variations of this flower with flowers colored white, blue, purple and pink, and many more. This listing is for the blue type and is a summer bi-annual bush plant. Flowers are a beautiful neon blue color with little bud with plenty of seeds inside. plants can get to 42 inches tall but tend to stay around 3 feet long. Great prairie flower and cover crop. Open pollinated bi-annual blue flower 41-88 days or late fall.