Black Knapweed

Wikimedia Commons

Plant Bio

Common Name:Black Knapweed
Family:Asteraceae
Genus:Centaurea
Species:nigra
Classification/Rank:Extremely Invasive
Method of Transportation:
Habitat/Range:

Description

• perennial herb that grows 0.1-0.8m tall • stems are erect, branched, and rough hairy • leaves are toothed, or shallowly lobed to entire, and are hairy above and below; lower leaves are long stalked and become unstalked with increasing plant height • flowers are disk shaped, purple, and found solitarily at the end of upper branches

News

view all news »
posted: November 3, 2018
“WeedsBMP” App for Forage and Livestock Producers Now Available

Land owners and managers have long recognized the need to control invasive plants to limit their impacts. In May 2018, a new smartphone app...

posted: August 28, 2018
More bioagents released to help control spotted knapweed

Bioagents are one tool in the fight against invasive plants, and they are intensly studied before release to ensure they won't switch to...