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Common Knapweed Seeds (Centaurea nigra)
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Common Knapweed Seeds (Centaurea nigra)

Common knapweed or hardheads is a colourful meadow plant of the thistle family. Tight purple flowers, with lance-shaped leaves. Forms dense clumps over time, ideal for sunny meadows and hedgebanks.

  • Height: 30 - 60 cm
  • Prefers: Full sun
  • Flowers: June - September
  • Seeds per gram: 500