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  • Centaurea nigra - Wikipedia
    Centaurea nigra is a species of flowering plant in the family Asteraceae, and is also known as lesser knapweed, common knapweed, black knapweed and bell weed
  • Washington State Noxious Weed Control Board
    Spotted knapweed is a very aggressive species that can quickly infest large areas Knapweed infestations increase production costs for ranchers, degrade wildlife habitat, decrease plant diversity, increase soil erosion rate and pose wildfire hazards
  • Common knapweed - The Wildlife Trusts
    Common knapweed, also known as 'black knapweed', is a thistle-like plant that can be found on all kinds of grasslands, from roadside verges to woodland rides, clifftops to lawns
  • Spotted Knapweed | Cornell Weed Identification
    Spotted Knapweed (Centaurea maculosa) is a biennial or short-lived perennial that is commonly found throughout the northeast and central-north of the US This weed typical grows on dry, low-fertility soils, and is a problem in New York pastures and disturbed areas
  • Weeds: Knapweeds – Centaurea spp. - Washington State University
    Knapweeds are short-lived perennials with stout taproots They can have one or more stems, reaching one to three feet in height Depending on species, leaves may be narrow and lance-shaped, lobed, or somewhat toothed to deeply divided
  • Knapweed: Pictures, Flowers, Leaves Identification | Centaurea nigra
    Knapweed (Centaurea nigra) is wild, edible and nutritious food Identify knapweed via its pictures, habitat, height, flowers and leaves
  • Knapweeds – Renz Weed Science
    Knapweeds are herbaceous biennials or perennials Seedlings emerge throughout the growing season and rosettes persist year-round Knapweeds bloom in summer with white to purple flowers As part of the aster family, knapweeds have composite flowers with each flowerhead made up of many tiny florets
  • Centaurea stoebesubsp. micranthos, spotted knapweed
    ative, invasive forb in parts of the United States It can occur in dense monocultures that displace native plants; reduce native plant and animal diversity; reduce native wildlife habitat and forage; alter soil physical and chemical properties; and inc ease surface water runoff and stream sedimentation It is most invasive in grasslands
  • Identification and control of knapweed species in Central and Eastern . . .
    Four species of Centaurea are commonly found in Central and Eastern Oregon, including spotted knapweed (Centaurea maculosa), diffuse knapweed (Centaurea diffusa), Russian knapweed (Centaurea repens) and yellow starthistle (Centaurea solstitialis)
  • Spotted knapweed (Centaurea stoebe subspecies micranthos)
    Spotted knapweed is a biennial or short-lived perennial herbaceous plant that grows two to three feet tall It can form dense cover in prairies, pastures, and open habitats





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