CITY AND COUNTY OF BROOMFIELD PARK OPERATIONS
NOXIOUS WEED IDENTIFICATION
DIFFUSE KNAPWEED: Centaurea diffusa Lam.
Characteristics:
Family: Aster
Discussion:
Diffuse Knapweed is a member of the Aster family. It is a winter annual, germinating in the Fall. A rosette develops and in the early summer a central stem bolts upright with multiple, branching stems. Flowers are usually white and sometimes pink or purple and are encompassed in a spiny bract. This weed is a prolific seed producer, and scatters its seed by tumbling. Diffuse Knapweed can be found along roadsides, disturbed areas and in dry rangeland.