Centaurea cyanus
Bushy base-branching annual cornflower with double blue flowers. Ideal as an edible bedding plant for a sunny position. Tolerant of a range of soils and both drought hardy and frost hardy annual. Pick edible blooms when quarter to half open.  Flowers have a long history of medicinal use but are rarely used these days. A blue dye can be obtained from the petals.  Good bee and butterfly attractor.  Space plants 30cm apart. Height 55cm. Punnet of 6 plants.