Reproducing only by seed.
Erect, much branched, 20-180 cm high, opposite orientation and greenish or purplish striped (Figure 3).
Leaves in a basal rosette the first year,
Noxious under the Ontario Weed Control Act.
Brown knapweed. A. Base of plant. B. Leaf and short branch at mid-stem. C. Leaves at top of stem. D. 1 involucral bract.
Figure showing stem orientation.
Leaf of brown knapweed.
Woody root of brown knapweed.