Catagory 1

spotted knapweed

Centaurea maculosa

ASTERACEAE (Sunflower family)

— short-lived perenial, sometimes biennial, with deep taproots that help it compete for water and nutrients

IDENTIFYING CHARACTERISTICS

  • Deeply lobed, "cobwebby" basal leaves
  • Generally purple flowers
  • Oval bracts with black-tipped fringe
  • Silvery appearing flowers open and turn
    to pinkish purple

This is a general table provided as a quick reference only. Treatments behave differently in different ecosystems.
What works in some areas of montana may not work in others. These treatments may also affect native and desirable plants.

spotted knapweed

cut mow
hand pull (wear gloves)
herbicide
biological control
reseeding
domestic animal
cultivate

effective

moderately effective-
effective in combination with other treatments
ineffective

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