Diffuse knapweed (Centaurea diffusa) is a native of the eastern Mediterranean and western Asia region. It is a bushy annual, biennial or short-lived perennial, but mostly biennial, with a mature size ...

December’s Weed of the Month is not one, but three species of knapweed: brown knapweed (Centaurea jacea), meadow knapweed (C. x moncktonii), and diffuse knapweed (C. diffusa). All three species are ...

Scientists have speculated for decades that spotted knapweed is able to spread over large areas because of a secret weapon -- an ability to release a chemical that kills surrounding plants. Until now, ...

When it comes to killing weeds, Boulder’s methods might seem a bit unconventional. Rather than using chemicals to take out diffuse knapweed and three types of thisles along the dams at Boulder ...

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As startling claims about knapweed’s virulence are retracted, CU researchers show that weed-eating bugs can help control invasive species without herbicides It’s not often that plants, even foreign ...

Its name isn't pretty and neither are its effects on native plants — and wildlife officials would like you to pull them when you see patches of diffuse knapweed. Diffuse knapweed was first introduced ...

After diffuse knapweed germinates, it develops into a rosette with grayish green leaves that are finely divided. As the plant bolts and matures, leaves develop short dense hair. Leaves located toward ...