The Meadow Knapweed Working Group is a multi-agency, multi-disciplinary team whose goals are to,

1. share and communicate all available information on the biology and control of meadow knapweed, and

2. cooperate in control efforts in order to maximize success and efficiency.

If you would like more information or would like to be a part of this group, contact Andrea.

 

What is Meadow Knapweed?

Meadow knapweed (Centaurea x pratensis Thuill; Asteraceae) is a fertile hybrid between two European species that are also invasive in the United States, black knapweed (C. nigra) and brown knapweed (C. jaceae).

Meadow knapweed is found throughout western Oregon and Washington; it has also been found in eastern Oregon and Washington and northwest Idaho. Populations of meadow knapweed have been rapidly expanding and new infestations are frequently found. Although meadow knapweed appears to first colonize roadsides, river and stream banks, and disturbed pastures, it is also capable of invading native prairies and meadows.

For more information:

Click here for the Western Invasives Network Meadow Knapweed page

Biology and Control,  New! Click here for a trifold brochure on the biology and control of Meadow Knapweed  You are welcome to use this brochure in your outreach efforts.

Biology and Control:   Click here to open a four page .pdf document by Pacific Northwest Extension

Biology and Control:   Best Management Practices for Meadow Knapweed, published by King County

Control:  Pacific Northwest Weed Management Handbook
      Chapter:  Control of Problem Weeds
      Section:  jimsonweed to knotweed

If you have any questions about the meeting, would like to add something to the agenda, or would like more information on the working group, please contact Andrea

 

 

Meetings and current projects

Minutes from Working Group meeting 12 March, 2009

 

 

We are currently developing a Best Management Practices matrix.  If you have any information on successful and unsuccessful control techniques, please contact Andrea