Acroptilon repens

Acroptilon repens_Russian knapweed_JM DiTomaso
Photo courtesy David Chang

Synonyms: Centaurea repens

Common names: Russian knapweed, hardheads, creeping knapweed, mountain bluet, Turkestan thistle

Acroptilon repens (Russian knapweed) is a perennial forb (family Asteraceae) found heavily through out California. It may have allelopathic properties. This plant is toxic to horses and crowds out native species.

Rating: Moderate

Cal-IPC Resources

  • Plant Assessment Form - Information gathered by Cal-IPC on the impacts, rate of spread, and distribution of invasive plants in California. Does not include management information.
  • CalWeedMapper - Statewide maps, climate models, and reports.
  • Cal-IPC News - Our quarterly newsletter. Each issue is available as a pdf.
  • Cal-IPC Symposium Proceedings - Presentations and papers from our annual Symposium.
  • Don't Plant a Pest! - Select your region to find non-invasive alternatives to ornamental species. Also see our statewide brochure on trees.

    Other Resources

    Symposium Presentations

    None for this species.

    Cal-IPC News Articles

    • Brusati, E., D. Morawitz, et al. (2011). Prioritizing Regional Response to Invasive Plants in the Sierra Nevada. Cal-IPC News. 19: 4, 5, 10.