Common Knapweed Perennial Seeds


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Also known as Black Knapweed or Hardheads. A common and familiar plant with thistle like flower heads but spineless leaves and stem. The flower heads, which are in bloom from June to September, are purple or occasionally white and exist in two forms, rayed and un-rayed. Behind the flower is a hard head of overlapping bracts which sits upon the slightly swollen end of the stem. Greater knapweed, which is always rayed, can look a little like the rayed form of Common knapweed but can be told apart by the following features. In Common knapweed the bracts that make up the 'hard head' are pale brown with black/brown bristly edges. However the degree of overlap obscures most of the pale brown. In Greater knapweed these bracts are grey-green with black/brown bristly edges but, because there is less overlapping, much of the bract is still visible. In Common knapweed the leaves of the upper stem are lanceolate and in Greater knapweed they are toothed. 

Pretty Wild Seeds are registered with the Department for Environment, Food & Rural Affairs (DEFRA) under number 7529, so you can have confidence in both our products and advice. Although our products are listed in weights and acres, we can supply in additional quantities upon enquiry so if you need a larger supply, please don't hesitate to give us a call.

  • 2,000 seeds (4g) for £2.45
  • 5,000 seeds (10g) for £3.99
  • Quantities from: £2.45

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    The Common Knapweed Perennial Seeds is shown in Wild Flowers > Wildflower Seeds.

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    We happily accept returns within 14 days from date of delivery. All returns must be received in the same condition and packaging we sent them. Postage charges will not be refunded on unwanted products.

    You are solely responsible for ensuring the goods are returned to us. We will not be liable for returns that are lost in the post or lost for any other reason. If a product arrives damaged we will advise the customer how to return the item with all return costs covered by us.  Replacements & refunds will be dispatched / issued on receipt of the returned items only.

    Habitat; Common knapweed is a tall, native, grassland perennial of low to moderately fertile soils but  is absent from very damp or acid sites. Habitats include meadows, pastures, road verges, field borders, waste ground, scrub land and woodland edges. It can persist for many years in both grazed pasture and neglected tussocky grassland. However, in order to regenerate it needs an opportunity to set seed and for that seed to become established into open ground. Flowers are pollinated by a wide range of insects including bees, flies, butterflies and beetles and the resulting seed heads attract goldfinches and other seed feeding birds. 

    Growing; Grows readily from seed sown at any time of the year.