Cornflower (Centaurea cyanus ) is a small annual flowering plant in the family Asteraceae, native to Europe. It may also be referred to as basketflower, though the term also refers to the Plectocephalus group of Centaurea, which is probably a distinct genus. It is an annual plant growing to 16-35 inches tall, with grey-green branched stems. The leaves are lanceolate, 1–4 cm long. The flowers are most commonly an intense blue colour, produced in flower heads (capitula) 1.5–3 cm diameter, with a ring of a few large, spreading ray florets surrounding a central cluster of disc florets. The blue pigment is protocyanin, which in roses is red. It flowers from June until August.