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Southern Interior Weed Management Committee

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Noxious weeds are non-native plant species that are difficult to control. In the absence of their natural predators and diseases, these weeds aggressively compete with native plants for water and nutrients, threatening the health of natural and economic resources and the industries that they support.

The Southern Interior Weed Management Committee (SIWMC) is a registered charity comprised of volunteer members representing private & public agencies, clubs and organizations in the Thompson-Nicola Region of British Columbia. Members of the society are dedicated to increasing awareness of invasive plants and associated losses caused to the natural and domestic resources of our region.

If you find an invasive weed here is the place to let someone know.. Report-A Weed ... or you can tell us through our contact us tab above.


 sulphur cinquefoil flower 1 oange hawkweed flower   spotted knapweed plant  blueweedflower1
 Sulphur Cinquefoil
Potentilla recta
 Orange Hawkweed
Hieracium aurantiacum
Spotted Knapweed
Centaurea biebersteinii 
Echium vulgare 



'Knapweed is highly competitive and capable of invading grassland sites to the exclusion of native vegetation. Domestic animals and wildlife, such as elk, rely on these range grasses and herbs for up to 80 percent of their diet. Knapweed encroachment can destroy the forage base and would result in a significant decline in deer and elk numbers. Over 40,000 hectares in BC are knapweed infested, reducing forage potential by up to 90 percent.'


Information taken from British Columbia Ministry of Agriculture and Lands
webpage: "Knapweed - Its Cost to British Columbia"

The goals of the SIWMC are to:

EDUCATE landowners and managers about invasive plant impacts on the natural diversity of the environment

PROMOTE integrated management for the prevention, eradication, control or containment of invasive plant species

ENCOURAGE expanded support for local invasive plant control programs and initiatives

ASSIST with management efforts of noxious and invasive weeds on public and private lands

INVENTORY invasive plants on private and public lands located within the Thompson-Nicola region

"Be wise about weeds"



To learn more, check out the new invaders page.


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