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Spotted Knapweed

A bush with purple flowers, rocky ground, and a river in the background.
  • Name: Spotted Knapweed (Centaurea stoebe)
  • ​Introduction: From Eurasia as a contaminant of alfalfa and clover seed
  • ​Habitat: Any disturbed soil
  • ​Infestation: Vacant lots, pastures, rangeland, roadsides, stream banks and landscaping
  • ​Available Control: Mechanical, chemical, and biological
  • ​Priority of Control: Preventing plant from going to seed, attack in rosette stage
  • ​Biological Controls: For more information about these biological control agents of Spotted Knapweed, please visit WSU Extension Integrated Weed Control Project.
  • ​For More Detail: Visit the Washington Noxious Weed Control Board listing for Spotted Knapweed.