There are a number of invasive plant species in the Central Kootenay.
Download our most recent priority list here (PDF - 44KB)

For more detailed information on the biology, distribution, and management strategy for each species in our region, please see the Invasive Plant Profiles

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Canada thistle

Canada thistle (Cirsium arvense) is an aggressive invader in crops, pastures, rangelands, roadsides and river banks. It spreads quickly vegetatively, and by wind-borne seeds. Each plant can produce 1500 seeds.

Canada thistle can be identified by its prickly leaves that are similar to holly. It can be distinguished from other thistles because it grows in dense patches, has relatively small seedheads, and has leaves that are not deeply lobed.

Canada thistle chokes out native plants, and impedes recreational activities. It is found throughout the Central Kootenays.

Repeated mowing can be used to help control Canada thistle by reducing seed set and weakening the plants. Two bioagent weevils, Rhinocyllus conicus and Larinus planus, have been released throughout the Central Kootenay with limited success. For other control options, see the link below.


Additional Information:
www.weedsbc.ca/pdf/canada_thistle.p ...

Invasive Plant Profile:
Canada thistle - Cirsium arvense - 1 MB

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