SafePlants

Lesser Knapweed (Centaurea nigra)

Lesser Knapweed, scientifically known as Centaurea nigra, is a flowering plant belonging to the daisy family (Asteraceae). It is also commonly referred to as Common Knapweed and Black Knapweed. Other vernacular names include Hardheads, Nob Weed, Spanish Buttons, and Sweeps Tassel.

Considerations for Pets

• The text mentions that Lesser Knapweed is a thistle-like plant. Thistles often have prickly or sharp parts that may cause discomfort or injury to pets if they brush against or ingest them.

Considerations for Children

• The text mentions that Lesser Knapweed is a thistle-like plant. Thistles often have prickly or sharp parts that may cause discomfort or injury to children if they brush against or handle them.

Taxonomy and Nomenclature

• Scientific Name: Centaurea nigra
• Family: Asteraceae (or Compositae), subfamily
• Synonyms: Centaurea jacea subsp nigra, Centaurea nemoralis

Distribution and Habitat

• Native to the UK and Europe.
• Abundant throughout Britain, often found by roadsides and in meadows.
• Suited to grassland and scrub environments.

Morphology and Growth

• Herbaceous perennial.
• Grows to a height of approximately 15-90cm, with a spread of up to 60cm.
• Upright perennial with lance-shaped or lanceolate leaves.
• Produces mauve or reddish-purple, thistle-like flowers.
• Flowerheads are rayed and up to 4 cm across.
• Flowers typically bloom from June onwards.

Ecological Role

• Highly attractive to bees and butterflies, providing a rich nectar source for insects.

Quirky Facts

• Lesser Knapweed may not exist as a separate entity in its own right but instead be related to Common Knapweed or Centaurea nigra subsp. nemoralis.