Photo Credit: Colorado State University Weed Science, modified from the original
Russian Knapweed is native to Eastern Europe and Asia and in the early 1900s it was introduced to North America as a contaminant in alfalfa seed.
This species is a serious concern on rangeland and pastures where it can out-compete desired plants and reduce biodiversity. It is also very toxic to horses.
This purple flowering knapweed has bracts that have a papery, almost translucent tip.
The leaves gradually become smaller up the plant, are grey-green in colour and usually have shallowly lobed edges.
Learn more about this species:
See Fact Sheets - Alberta Invasive Species Council