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Knotweeds

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Knotweeds

Four knotweed species are currently found in British Columbia: Japanese knotweed (Fallopia japonica), Giant knotweed (Fallopia sachalinensis), Bohemian knotweed (Fallopia x bohemica), and Himalayan knotweed (Polygonum polystachyum). All four species are similar in appearance, biology, impacts, distribution, and methods of control and will be discussed under the general title of “knotweeds”. Knotweeds are one of the 100 worst invasive species as identified by the International Union for Conservation of Nature (IUCN) and a top-ten invasive species for control in BC. Its ability to tolerate a range of soil types and climates means that it has the potential to spread much further than it has to date.

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