Noxious Weeds Blog

All things noxious weeds. Written by program specialists in King County, Washington

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Tag: knotweed

Knotweed infestation through seasons: lush green, to yellowing, to dead canes
December 20, 2023June 20, 2024 kcweeds

What is Plant Dormancy & Why Does it Matter?

A noxious weed specialist spraying knotweed. The knotweed is growing several feet over head.
December 6, 2023March 27, 2024 kcweeds

King County’s Knotweed Control Program: Then and Now

A visual of mulching layers. The top later is 4-12 inches of heavy mulch, which is defined as arborist chips or bark/coarse mulch. The second layer is a paper layer, comprised of cardboard or newspaper. The final layer is weeded soil. 1-2 inches of compost layer are also interspersed throughout.
September 22, 2023December 20, 2023 kcweeds

Weedy Fall Activities

photo collage of a green shrub in bottom right, smoking volcano in background, paper yellow sun in top right corner
July 25, 2023December 6, 2023 kcweeds

Are weeds “weedy” in their native range?

September 29, 2020March 20, 2023 kcweeds

I dream of knotweed: the Water and Land Resources Division at work

Invasive Species & Exotic Pest Workshop March 29, 2019 in Bellingham, WA
February 13, 2019 kcweeds

Cross-border workshop on invasive species and exotic pests in Bellingham March 29

milk thistle seedlings in fall
October 10, 2018October 12, 2018 kcweeds

Control weeds in the fall to reduce work next year

June 15, 2018 kcweeds

Knotweed control classes offered June 20 and June 26

June 15, 2018 theweedsbeat

Invasive weeds that are ripe for action this time of year

cover image of the 2018 King County Noxious Weed List
February 8, 2018 kcweeds

King County Weed Board approves noxious weed list for 2018

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