Widespread in the temperate zones, this daisy family (Asteraceae) genus, commonly known as cornflower or knapweed, encompasses around 450 species of annuals, perennials, and subshrubs. They are a variable lot, though most are readily identifiable by their thistle-like flower-heads, which emerge from an egg-shaped whorl of bracts. The flowerheads often have distinctly different inner and outer florets, with those on the outer having narrow petals. Flower colors include white, yellow, pink, mauve, and blue. Plant size varies greatly, but common features are feather-like foliage, often silver-gray, and an upright habit. Centaurea was named after Chiron the Centaur, the Greek mythological figure farmed for his healing powers, because some species have been used to treat wounds.
CULTIVATION
Plant in light well-drained soil in full sun. Good ventilation will lessen any mildew problems. Annuals such as the common cornflower (Centaurea cyanus) are raised from seed; perennials may be propagated by division or from softwood cuttings of non-flowering stems.
Top Tip
Cornflowers will bloom reliably over a long season. Deadheading will often encourage a further show of flowers and increased flower production.
CULTIVATION
Plant in light well-drained soil in full sun. Good ventilation will lessen any mildew problems. Annuals such as the common cornflower (Centaurea cyanus) are raised from seed; perennials may be propagated by division or from softwood cuttings of non-flowering stems.
Top Tip
Cornflowers will bloom reliably over a long season. Deadheading will often encourage a further show of flowers and increased flower production.
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