Spotted Knapweed

Julianne Leekie

Plant Bio

Common Name:Spotted knapweed
Family:Asteraceae
Genus:Centaurea
Species:biebersteinii
Classification/Rank:Extremely Invasive
Method of Transportation:Vehicles, in hay and on/through animals.
Habitat/Range:Open areas with well-drained soils such as grass-lands, roadsides, right-of-ways and open forests. Tolerant to dense shade.

Description

Spotted knapweed (Centaurea biebersteinii) is a very competitive weed of dry open sites. It displaces desirable forage and native plant species reducing the landscape carrying capacity for livestock and wildlife.



Spotted knapweed grows up to 1.5 m tall and has purple (occasionally white) flowers found at the ends of branches. The flowerhead has black-tipped bracts ("scales") that give the plants a spotted appearance. It can act like a biennial or short-lived perennial. It has hairy, deeply-cut leaves that become smaller towards the top of the plant.

For more information on Spotted knapweed visit the Weeds BC Spotted knapweed webpage. To report this plant call 1-866-44WEEDS or use the Report-A-Weed application.

News

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posted: October 6, 2018
AGM coming up - October 30 in Smithers!

2018 AGM and General Members' Meeting

 

DATE: Tuesday, Octover 30, 2018, 10:00 am to 2:00 pm.

PLACE: Royal Canadian Legion, Branch 63,...

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...