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Select a plant common name (left) or Latin name (right) from the lists below or click on a thumbnail photo to read individual plant information.

Orange & yellow flowers

bighead knapweed
buffalobur
common tansy
Dalmatian toadflax
dyer's woad
garden loosestrife
gorse
leafy spurge
myrtle spurge
orange hawkweed
perennial sowthistle
rush skeletonweed
Scot's broom
Spanish broom
common St. Johnswort
sulfur cinquefoil
tansy ragwort
Texas blueweed
velvetleaf
yellow hawkweed
yellow starthistle
yellow toadflax

Pink & purple flowers

annual bugloss
bittersweet nightshade
black knapweed
brown knapweed
bull thistle
Canada thistle
clary sage
common bugloss
common crupina
diffuse knapweed
goatsrue
herb Robert
kudzu
meadow clary
meadow knapweed
Mediterranean sage
milk thistle
musk thistle
policeman's helmet
purple loosestrife
purple starthistle
Russian knapweed
saltcedar
Scotch thistle
slenderflower thistle
spotted knapweed
viper's bugloss
vochin knapweed
wild four o'clock

White & green flowers

English ivy
field bindweed
garlic mustard
giant hogweed
giant knotweed
Himalayan knotweed
Japanese knotweed
kochia
lawnweed
old man's beard
oxeye daisy
perennial pepperweed
poison hemlock
Spurge Laurel (Daphne laureola)
Syrian bean-caper
wild carrot
yellow nutsedge

Aquatic plants

Brazilian elodea
common cordgrass
dense-flowered cordgrass
Eurasian watermilfoil
fanwort
floating primrose-willow (Ludwigia peploides)
yellow flag iris
fragrant water lily
hydrilla
parrotfeather
phragmites
reed canary grass
saltmeadow cordgrass
smooth cordgrass
water primrose
yellow floating heart

Related information

Related agencies

Report a weed

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).