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Centaurea cyanus 'Black Ball'


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Key information

Plant type

Hardy annual

Flower colour






Skill level


Centaurea cyanus 'Black Ball'

Plant details

The annual blue cornflower, Centaurea cyanus, is a slender plant bearing pretty flowers in rich shades of blue. It's commonly used in pictorial and annual meadow schemes, and makes an excellent cut flower. Cultivars of the species may have red, pink, and white flowers.

Centaurea cyanus 'Black Ball' bears unusual chocolate-coloured flowers on thin wiry stems. It's extremely attractive to bees.

For best results, grow Centaurea cyanus 'Black Ball' in moist but well-drained soil, in full sun. The wiry plants may need support in exposed situations. Deadhead spent blooms to prolong flowering in summer, but leave seeds to develop towards autumn, as these will provide food for birds.

Family: Asteraceae

Genus: Centaurea

Species: cyanus

Cultivar: Black Ball

Plant type: Hardy annual

Flower colour: Purple

Foliage colour: Blue-green

Feature: Flowers

Sun exposure: Full sun

Soil: Well-drained/light

Hardiness: Hardy

Skill level: Beginner

Height: 75cm

Spread: 30cm

Time to plant seeds: September to April

Flowering period: June to August

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