Cornflower

Centaurea cyanus

Description
Annual in summer crops, hibernating to biennial in winter crops, 20-70 cm (7.87 - 27.55 inch) tall.

Characteristic Features
Young plant with rosettes, shiny blue flowers.

Cotyledons
Dense, vigorous, broad-oval to oval, narrowing to the base.

Stems
Up to 1 m (39.37 inch) tall, tomentose to arachnoid pubescent, herbaceous, loosely wooly-hairy when young but losing this as they mature.

Leaves
Leaves narrow, often linear, mostly entire, or the lower ones sometimes shallowly toothed or lobed, up to 13 cm (5.12 inch) long and 1 cm (0.39 inch) wide, excluding the lobes, white-woolly on the lower surface.

Plant Protection Products