Centaurea stoebe
Centaurea stoebe spotted knapweed
![Plant grows in the wild/spontaneously Plant grows in the wild/spontaneously](/Modules/Zulatm.WebPlants/Content/WildIcon.png)
![Plant is invasive in PA Plant is invasive in PA](/Modules/Zulatm.WebPlants/Content/InvIcon.png)
Although the flowerheads of knapweed look similar to those of thistles, knapweeds do not have any prickles on any plant parts. The spotted knapweed's flowers can be either pink, purple, or white. The flower bracts supporting the flowerheads have black triangular tips. This knapweed is introduced from Europe and has become invasive.
Habitat & Range
Commonly naturalized in dry woods, fields, roadsides, and shale barrens.
Present throughout the state.
Wetland code: Not classified
Phenology
Flowers June to October.