Alien weed, mostly of roadsides and waste places. Occasional along the edges of the Park and along Wildwood Drive. Also does well in the gravel parking area near the entrance.

Tyrol knapweed (C. nigrescens) has leaves that are narrow, but not divided into linear segmens, and the flowers are usually more pink to rose. Sometimes confused with common burdock, which has flowerheads of about the same size and color; however, the flowerheads of burdock are more compact and the leaves are large and undivided.