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  • Knapweed Removal Information - How To Get Rid Of Knapweed . . .
    Knapweed removal can be time consuming and frustrating, but if you're watching carefully, you can eradicate this annoying weed from your landscape What is Knapweed? Knapweed is a noxious weed that is often found in ditches, along highways, in waterways, and other scrubby areas
  • How to Kill Knapweed: A Noxious Weed Found in Yards, Pastures . . .
    Knapweed is a noxious weed found in many places: yards, pastures and forests True control of this weed takes a few seasons Learn how to kill it here
  • Knapweed: Pictures, Flowers, Leaves Identification . . .
    Knapweed (Centaurea nigra) is wild, edible and nutritious food Identify knapweed via its pictures, habitat, height, flowers and leaves
  • 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 It is in bloom from June to September and is a huge favourite of all kinds of butterflies, including common blues, marbled whites and meadow browns, and is sometimes
  • Russian Knapweed - National Invasive Species Information . . .
    Russian knapweed (Rhaponticum repens) is a nonnative weed in the western United States It was introduced in the late 1800’s and is now invading and degrading cropland, rangeland, riparian areas, and roadsides
  • Knapweeds – Renz Weed Science - University of Wisconsin . . .
    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
  • Spotted knapweed identification and control - King County
    Spotted knapweed is a regulated Class B noxious weed Control is required in King County Spotted knapweed is also on the Washington quarantine list making it illegal to buy, sell, or offer it for sale in the state Spotted knapweed is known as Centaurea stoebe and it is in the aster (bean) family Another common name for this plant is panicled
  • Spotted knapweed - Extension at the University of Minnesota
    Spotted knapweed is an invasive species Spotted knapweed is found in artificial corridors such as gravel pits, railroad beds and field margins, and can spread to nearby woodlands and prairies Seeds are dispersed by rodents, livestock and commercial hay
  • 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 Cattle and other animals avoid eating it so it can cause large reductions in available food for grazing animals





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