Knapweed

Centaurea cyanus 'Black Ball'

Knapweed - Centaurea cyanus  'Black Ball'

Common Name: Knapweed
Genus: Centaurea
Species: cyanus
Cultivar: 'Black Ball'

Category: Annuals & Biennials
Growth Rate: Average
Features: Good for wildlife

Hardiness: HardyHeight: 0.40 m (40 cm)
Sun/Shade: Full sunSpread: 0.20 m (20 cm)

Foliage Type: DeciduousFlower Colour: Brown, Red
Foliage Colour: GreenFlowering Period: May to July

Soil Type: Normal/Loam or Sandy/Light or Chalky/Alkaline
Soil Moisture: Dry, well drained or Moist, but well drained

Ravishing dark crimson flowers which look almost black on cloudy days appear from May to July. They sit on top of upright branching stems looking like miniature pom-poms - and are altogether charming. Ideally suited to wildflower meadows or naturalised planting schemes the flowers will hold their colour well and will attract beneficial insects in their droves. This is an annual plant which will die after flowering but in the right conditions it will set seed so you will have more plants the following year.

  • Garden care: Deadhead regularly to prolong the flowering and then let the flowers set seed. These can be sown in situ for more plants (which may come up with differently coloured flowers) in subseqent years.


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