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coastal region, the Shuswap, Kitimat, Stikine, Skeena, Columbia, Okanagan, and Kootenay areas, as well as the Queen Charlotte Islands. Additional plants may exist in many gardens in communities across B.C. Not surprisingly, most of the knotweed plants have been purposefully planted. This is something we are striving to change, as the invasion of knotweeds into a landscape has many negative economic, ecological and aesthetic impacts.


Because knotweeds are so hardy and spread aggressively, they are capable of blocking access to waterways, reducing sightlines along roads and fences, shading out native plants, dominating riparian areas and increasing soil erosion. And let’s not forget about that potential to undermine your building foundation. Preventing the spread of knotweed starts with being able to identify the plant and avoid planting it in your yard. Controlling the spread or managing existing knotweeds will require diligent and continuous action.


If you have knotweed, an integrated management plan of several different methods of control may be needed as these invaders are extremely persistent and have such an extensive root system and carbohydrate reserve.


It is best to consult with a specialist to determine your best options for control. One method is to cut the stem down short and inject herbicide into the stem continually over the spring and summer for the next few years in hopes of depleting the root reserves.


If the infestation is relatively small, using a black tarp and eliminating its light source may work in conjunction


Long lasting control of hard to target pests.


with other treatments.


The Ministry of Forests, Lands and Natural Resource Operations has joined forces with the Knotweed Biocontrol Consortium to work with scientists from around the world in hopes of discovering a suitable biocontrol agent or natural insect enemy.


— Lisa Scott is with the South Okanagan-Similkameen Invasive Plant Society. To learn more about knotweed or other invasive plants in this region, go to:


www.invasiveplantcouncilbc.ca Shift for performance.


Canadian Farm Business Management Council


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LISA SCOTT


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