Russian Knapweed
Centaurea repens

Russian Knapweed adult
A perennial, Russian knapweed grows two to three feet tall.
Russian Knapweed rosette
Basal leaves are lobed and are two to four inches in length.
Weed Infestation
Russian Knapweed infestation
Russian knapweed is native to Eurasia. It infests rangelands, field edges, pasture, roadsides, and other disturbed soils. Knapweed's release chemical substances into the soil that inhibit the growth of competing vegetation. It can cause "Chewing disease" in horses that consume it.
Russian Knapweed flower
It has pinkish flowers. Bloom is early summer through late summer.
Tap Root
Russian Knapweed root
Roots are black and may go eight feet deep or more.
Flower Bract
Russian Knapweed bract
Flower bracts have membranous cream-colored tips.