description Spotted Knapweed Overview
Spotted knapweed (Centaurea stoebe) is a Eurasian herb in the daisy family, Asteraceae, that is invasive in many North American grasslands and rangelands. It produces pink to purple flower heads above branched stems, and the dark-tipped bracts beneath each head give the plant its common name. The species spreads readily in disturbed ground and can release allelopathic compounds that suppress the growth of nearby plants, adding to its effects on native plant communities.
help Spotted Knapweed FAQ
What does spotted knapweed look like?
Spotted knapweed, or Centaurea stoebe, has pink to purple flower heads on branched stems. The bracts below each flower head have dark, spot-like tips.
Where did spotted knapweed come from?
It is native to Eurasia and belongs to the daisy family, Asteraceae. It has become invasive in many North American grasslands and rangelands.
Why is spotted knapweed considered invasive?
Spotted knapweed can spread through grasslands and rangelands where it competes with native plants. Dense infestations can reduce the forage available to grazing animals.
How can I identify spotted knapweed in the field?
Look for branched stems, pink or purple flower heads, and dark-tipped bracts beneath the heads. Those bracts are one of the most useful clues for separating it from similar knapweeds.
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