Noxious Weeds Blog

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

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Category: Weed of the Month

Sprig of holly showing spiny waxy leaves and bright red pea-sized berries.
February 17, 2026February 17, 2026 kcweeds

The 2026 Noxious Weed List is Official!

fringe cup next to garlic mustard showing leaf similarity
June 11, 2025July 7, 2025 kcweeds

Garlic Mustard Look-a-like Guide

Sprig of holly showing spiny waxy leaves and bright red pea-sized berries.
March 18, 2025January 29, 2026 kcweeds

The 2025 Noxious Weed List is Official!

poison hemlock clusters of white flowers
May 22, 2024March 18, 2025 kcweeds

Poison Hemlock: Know it, Dig it, Trash it

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

1 larger photo of yellow flower in field on left, 3 stacked photos on right of flowers: purple poofy, yellow with heart shaped petals, and white trumpet shaped
June 20, 2023June 20, 2025 kcweeds

Summer Weeds to Watch for

Green leaves with droplets of water and white veins are attached to a stem. One yellow flower with five petals blooms on this same stem.
June 20, 2023July 25, 2023 kcweeds

Early Weed Detection Protects Wetlands

January 12, 2022March 20, 2023 kcweeds

Old man’s beard – January 2022 Weed of the Month

bull thistle plant
February 19, 2021March 20, 2023 kcweeds

Bull thistle – February 2021 Weed of the Month

September 16, 2020March 20, 2023 kcweeds

Fragrant Water Lily – September 2020 Weed of the Month

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