• HOME
    • ABOUT US
      • In the beginning, and now
      • Our objectives
      • Our team
    • NEWS
    • SPECIES
      • Wild Flower Species
      • Wild Grasses, Sedges and Rushes
      • Amenity and agricultural cultivars
      • Method for sowing species
      • Sowing Yellow Rattle
      • Growing Wild Orchids
    • MIXTURES
      • Complete Mixtures
        • General Purpose Meadow Mixtures
        • Meadow Mixtures for Specific Soils
        • Brush Harvested Meadow Mixtures
        • Special Habitat mixtures
        • Cornfield Annuals
      • Wild Flower Only Mixtures
      • Grass Only Mixtures
      • Mixtures and sowing rates
      • Sowing and Aftercare
        • Ground Preparation
        • Sowing
        • Aftercare
    • ADDITIONAL INFORMATION
    • COMPLETELY WILD
    • BASKET
    • CONTACT
    • CATALOGUE REQUEST
    • ORDERING
    • SIGN IN/ REGISTER

EMORSGATE SEEDS

Completely Wild Since 1980

By Appointment to HRH The Prince of Wales

Suppliers of Wild Flower and Grass Seeds

Emorsgate Seeds, King’s Lynn

Previous product
Nettle-leaved Bellflower - Campanula trachelium £1.00
Back to products
Next product
Common Spotted-orchid £1.00

Common Knapweed – Centaurea nigra

£1.00

(Somerset)

Please note: We do not export outside of the UK.
We are unable to deliver to Northern Ireland, Channel Islands and Isle of Man.

£ / 1g : £ 3.00

£ / 10g : £ 8.00

£ / 100g : £ 26.40

£ / 1000g : £ 240.00

Seeds per gram : 450

  • Description
Description

Description

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 (top picture on the left) and un-rayed (second picture down). 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.

Habitat Information

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 Information

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

Reviews

There are no reviews yet.

Be the first to review “Common Knapweed – Centaurea nigra” Cancel reply

You must be logged in to post a review.

Related products

  • Garlic Mustard – Alliaria petiolata

    £1.00 Add to basket
  • Sold out

    Spear-leaved Orache – Atriplex prostrata

    £1.00 Read more
  • Sold out

    Mugwort – Artemisia vulgaris

    £1.00 Read more
  • Sold out

    Pheasant’s-eye – Adonis annua

    £1.00 Read more
  • Corn Marigold – Glebionis segetum – (Chrysanthemum segetum)

    £1.00 Add to basket
  • Greater Knapweed – (Centaurea scabiosa)

    £1.00 Add to basket
  • Columbine – Aquilegia vulgaris

    £1.00 Add to basket
  • Ramsons – Allium ursinum

    £1.00 Add to basket
  • close
    • HOME
    • ABOUT US
      • In the beginning, and now
      • Our objectives
      • Our team
    • NEWS
    • SPECIES
      • Wild Flower Species
      • Wild Grasses, Sedges and Rushes
      • Amenity and agricultural cultivars
      • Method for sowing species
      • Sowing Yellow Rattle
      • Growing Wild Orchids
    • MIXTURES
      • Complete Mixtures
        • General Purpose Meadow Mixtures
        • Meadow Mixtures for Specific Soils
        • Brush Harvested Meadow Mixtures
        • Special Habitat mixtures
        • Cornfield Annuals
      • Wild Flower Only Mixtures
      • Grass Only Mixtures
      • Mixtures and sowing rates
      • Sowing and Aftercare
        • Ground Preparation
        • Sowing
        • Aftercare
    • ADDITIONAL INFORMATION
    • COMPLETELY WILD
    • BASKET
    • CONTACT
    • CATALOGUE REQUEST
    • ORDERING
    • SIGN IN/ REGISTER
    Copyright 2022 Emorsgate Seeds All Rights Reserved. Web design by Dsgn One
    • Terms of Use
    • Privacy Policy
    • Sitemap
    • HOME
    • ABOUT US
      • In the beginning, and now
      • Our objectives
      • Our team
    • NEWS
    • SPECIES
      • Wild Flower Species
      • Wild Grasses, Sedges and Rushes
      • Amenity and agricultural cultivars
      • Method for sowing species
      • Sowing Yellow Rattle
      • Growing Wild Orchids
    • MIXTURES
      • Complete Mixtures
        • General Purpose Meadow Mixtures
        • Meadow Mixtures for Specific Soils
        • Brush Harvested Meadow Mixtures
        • Special Habitat mixtures
        • Cornfield Annuals
      • Wild Flower Only Mixtures
      • Grass Only Mixtures
      • Mixtures and sowing rates
      • Sowing and Aftercare
        • Ground Preparation
        • Sowing
        • Aftercare
    • ADDITIONAL INFORMATION
    • COMPLETELY WILD
    • BASKET
    • CONTACT
    • CATALOGUE REQUEST
    • ORDERING
    • SIGN IN/ REGISTER
    Sidebar