Alert!! Knotweeds (Japanese, Bohemian, Giant, Himalayan)
- Sharon Cody
- 2 days ago
- 1 min read
Knotweeds are considered one of the top ten most invasive species in the world and they
are legally declared a noxious weed in Washington State. This highly invasive bamboo-like
plant can easily spread and develop new colonies by stem and root fragments as small as
1⁄2”. By letting newly cut canes and rhizomes float free in Lake Samish, the infestation
multiplies and becomes a huge problem for your neighbors around the lake and in
downstream riparian ecosystems, preventing water access, crowding out native plants and
interfering with the food web for salmon and other fish.
All cut knotweed stems and rhizomes need to be disposed of and sealed in
sturdy plastic bags to ensure that plant fragments do not resprout.
Do not dispose of any parts of the plant into waterways.
Never put knotweed stems or roots in a home composting system.
Control is difficult, but there are options. Please see this info from Whatcom County.
Timing is everything with regards to successful knotweed control so please read and
follow the directions in this document. If you need additional help figuring out a method
which will work for your particular site please call Whatcom County Noxious Weed Control
Board for a site-specific recommendation at: 360-778-6234
Knotweed News
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