Centaurea diffusa diffuse knapweed
Asteraceae (Sunflower) Family
Washington State-designated as a noxious weed (control required by law)
Non-native Introduced from Central Asia in mid-1800s; now grows throughout Western and Midwestern U.S. & Canada.
Description:
- Upper leaves-narrow
- Lower leaves-divided
- Form a basal rosette
- Grows upright from a taproot
- Annual or short-lived perennial
- Stems branch profusely
- Flowers: white, rose, or purple
- The bracts are covered with comb-like spines
Habitat: widespread & aggressively invasive in non-shaded, well-drained soils in pastures, travel corridors, & bare ground
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- Photo by: Lisa Robinson
