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Noxious weeds

King County, Washington

To offer a suggestion or report an error on the King County Noxious Weeds website, please contact Sasha Shaw, education specialist.

Brochures and publications

Most of our brochures and publications are available for download from the list below. If you would like one of our booklets, "Citizens Guide to Noxious Weeds" or "Water Weeds: Guide to Aquatic Weeds in King County", a copy of the brochure "Neighborhood Bullies: Invasive Weeds in Urban Lands" or printed copies of any of the following brochures, please email us or phone us at 206-477-WEED (206-477-9333) and we can send you what you need.Neighborhood Bullies - click to downloadCitizens Guide to Noxious Weeds - click to downloadCover of Water Weeds Aquatic Weed Guide - click to download brochure

You will need Acrobat Viewer to read most of these.

General materials

2013 King County Noxious Weed List (1.06 Mb)
Best Management Practices (link)
Citizens Guide to Noxious Weeds (Note: large file, 5.8 Mb)
Coloring Book (571 Kb)
Garden Wise: Non-Invasive Plants for Your Garden (external link)
Neighborhood Bullies: Invasive Weeds in Urban Lands (2.6 Mb)
Noxious Weed Regulatory Guidelines (197 Kb)
Poisonous Plants of Western WA (160 Kb)
Plants Poisonous to Livestock in the Western States (external link - can download file or request paper copy)
Reference List (61.3 Kb)
Washington Prohibited Plants List (external link)
Water Weeds: Guide to Aquatic Weeds in King County (2.9 Mb)

En español

Malezas nocivas: leyes y epecies selectas en la región del oeste de Washington (416 Kb)
Malezas nocivas: leyes y epecies selectas en la región del este de Washington (397 Kb)
Malezas nocivas leyes en Washington (31 Kb)
Giant hogweed folleto informativo (información sobre identificación y control) (960 Kb)
Knotweed (poligonáceas) folleto informativo de WSDA (214 Kb)
Purple loosestrife folleto informativo (información sobre identificación y control) (965 Kb)
Tansy ragwort folleto informativo (información sobre identificación y control)  (638 Kb)

Slide shows

Identification and Control of Selected Noxious Weeds (Adobe pdf formant, 36.4 Mb)
Knotweed Biology and Control - 2014 Version
(Adobe pdf format, 15.9 Mb)
Aquatic Noxious Weeds Slideshow (PowerPoint, 5.7 Mb)
Gardener's Guide to King County Noxious and Invasive Weeds (PowerPoint, 16.5 Mb)
Middle Fork Snoqualmie Weeds (PowerPoint, 10.2 Mb)
Seattle Invasive Weed Slide Show (PowerPoint, 8.6 Mb)
Lake Desire Noxious Weeds - Control Techniques (Adobe pdf format, 2.31 Mb)
Invasive Weeds - Student Talk 2014 (PowerPoint, 11.6 Mb)

Reports - annual and project reports (link)

Specific weeds

Bindweed (Convolvulus sepium)
Bindweed/Morning Glory Weed Alert (199 Kb)

Bittersweet nightshade (Solanum dulcamara)
Bittersweet Nightshade Best Management Practices (256 Kb)
Bittersweet Nightshade Weed Alert (155 Kb)

Blackberry (Rubus spp.)
Blackberry Best Management Practices (228 Kb)
Blackberry Weed Alert (191 Kb)

Brazilian elodea (Egeria densa)
Brazilian Elodea Best Management Practices (283 Kb)

Broom (Cytisus, Spartium)
Scotch Broom Best Management Practices (344 Kb)
Scotch Broom Weed Alert (233 Kb)
Spanish Broom Best Management Practices (420 Kb)
Spanish Broom Weed Alert (160 Kb)

Buttercup (Ranunculus spp.)
Creeping Buttercup Weed Alert (183 Kb)

Butterfly bush (Buddleia davidii)
Butterfly Bush Weed Alert (233 Kb)
Butterfly Bush WSU Extension Bulletin (788 Kb)

Common reed/Phragmites (Phragmites australis)
Common Reed (Phragmites) Best Management Practices (310 Kb)

English ivy (Hedera helix)
English Ivy Weed Alert (210 Kb)
English Ivy Alternatives Sheet (454 Kb)
English Ivy Bulletin (743 Kb)

English holly (Ilex aquifolium)
English Holly Weed Alert (220 Kb)

Fragrant water lily (Nymphaea odorata)
Fragrant Water Lily Best Management Practices (198 Kb)
Fragrant Water Lily Weed Alert (226 Kb)

Garlic mustard (Alliaria petiolata)
Galic Mustard Best Management Practices (294 Kb)
Garlic Mustard Weed Alert (202 Kb)

Giant hogweed (Heracleum mantegazzianum)
Giant Hogweed Best Management Practices (285 Kb)
Giant Hogweed Weed Alert (253 Kb)
Giant hogweed folleto informativo (informacion sobre identificacion y control) (960 Kb)

Goatsrue (Galega officinalis)
Goatsrue Weed Alert (304 Kb) 

Gorse (Ulex europaeus)
Gorse Best Management Practices (374 Kb)
Gorse Weed Alert (205 Kb)

Groundsel (Senecio vulgaris)
Common Groundsel (273 Kb)

Hairy willowherb (Epilobium hirsutum)
Hairy Willowherb Weed Alert (219 Kb)

Hawkweed (Hieracium spp.)
Hawkweed Best Management Practices (263 Kb)
Hawkweed Weed Alert (176 Kb)
European Hawkweed (Hieracium sabaudum) Weed Alert (225 Kb)

Herb Robert (Geranium robertianum)
Herb Robert Best Management Practices (320 Kb)
Herb Robert Weed Alert (204 Kb)

Knapweed (Cenaturea spp.)
Bighead Knapweed Weed Alert (160 Kb)
Diffuse Knapweed Best Management Practices (204 Kb)
Knapweed ID Brochure (317 Kb)
Meadow Knapweed Best Management Practices (259 Kb)
Meadow Knapweed Weed Alert (166 Kb)
Spotted Knapweed Best Management Practices (187 Kb)
Spotted Knapweed Weed Alert (131 Kb)

Knotweed (Polygonum spp.)Stop the Spread of Invasive Knotweed - click to download
Invasive Knotweed Brochure (2 Mb)
Himalayan Knotweed Fact Sheet (156 Kb)
Knotweed Best Management Practices (281 Kb)
Knotweed Weed Alert (215 Kb)
Knotweed Biology and Control Slide Show (Note: slide show, 3.12 Mb)
Knotweed (poligonaceas) folleto informativo de WSDA (214 Kb)

Loosestrife (Lysimachia, Lythrum)
Garden Loosestrife Best Management Practices (355 Kb)
Garden Loosestrife Weed Alert (232 Kb)
Purple Loosestrife Bet Management Practices (304 Kb)
Purple Loosestrife Weed Alert (257 Kb)
Purple loosestrife folleto informativo (informacion sobre identificacion y control) (965 Kb)

Milfoil (Myriophyllum sp.)
Milfoil Best Management Practices (407 Kb)

Old man's beard (Clematis vitalba)
Old Man's Beard Best Management Practices (334Kb)
Old Man's Beard Weed Alert (170 Kb)

Poison-hemlock (Conium maculatum)
Poison Hemlock Weed Alert (234 Kb)

Policeman's helmet (Impatiens glandulifera)
Policeman's Helmet Best Management Practices (163 Kb)
Policeman's Helmet Weed Alert (267 Kb)

Reed canarygrass (Phalaris arundinacea)
Reed Canarygrass Weed Alert (300 Kb)

Sulfur cinquefoil (Potentilla recta)
Sulfur Cinquefoil Best Management Practices (224 Kb)
Sulfur Cinquefoil Weed Alert (203 Kb)

Tansy (Tanacetum vulgare)
Common Tansy Best Management Practices (199 Kb)

Tansy ragwort (Senecio jacobaea)
Tansy Ragwort Best Management Practices (186 Kb)
Tansy Ragwort Weed Alert (201 Kb)
Tansy ragwort folleto informativo (informacion sobre identificacion y control) (638 Kb)

Thistle (Cirsium, Silybum)
Bull Thistle Best Management Practices (234 Kb)
Bull Thistle Weed Alert (178 Kb)
Canada Thistle Weed Alert (147 Kb)
Milk Thistle Best Management Practices (386 Kb)
Milk Thistle Weed Alert (190 Kb)

Toadflax (Linaria dalmatica ssp. dalmatica)
Dalmatian Toadflax Best Management Practices (269 Kb)

Velvetleaf (Abutilon theophrasti)
Velvetleaf Weed Alert (198 Kb)

Yellow archangel (Lamiastrum galeobdolon)
Yellow Archangel Weed Alert (204 Kb)

Yellow flag iris (Iris pseudacorus)
Yellow Flag Iris Best Management Practices (318 Kb)

Related information

Related agencies


Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104. To contact staff, see the Noxious Weed Control Program Directory, send an email, or call 206-477-WEED (206-477-9333).