Spotted knapweed (Centaurea stoebe) is a biennial or short-lived perennial native to Eastern Europe. It was introduced into ...

Russian Knapweed (Rhaponticum repens) is a creeping perennial native to Eurasia. It was introduced into the U.S. as a ...

The Minnesota Department of Agriculture is alerting farmers and other landowners about spotted knapweed ? a nasty weed that is showing up with increasing frequency in parts of Minnesota.