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Noxious weeds
Identification and control guidance and resources for noxious weeds and invasive plants in King County
Find a weed
Search for a noxious weed by common or scientific name to learn more about impacts, identification, and methods of control.
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Select the common name of a noxious weed to view a page with detailed information about the weed.
- Absinth wormwood
- Autumn hawkweed
- Bighead knapweed
- Bindweed (morning glory)
- Bird cherry
- Birdsfoot trefoil
- Bishop's weed
- Bittersweet nightshade
- Black locust
- Blueweed
- Broadleaf and narrowleaf peavines
- Buffalobur
- Bull thistle
- Bur chervil
- Butterfly bush
- Cherry laurel
- Clary sage
- Common catsear
- Common crupina
- Common fennel
- Common groundsel
- Common hawkweed
- Common hawthorn
- Common holly
- Common ivy
- Common tansy
- Common teasel
- Cordgrasses
- Cotton thistle
- Creeping buttercup
- Creeping (Canada) thistle
- Curly-leaf pondweed
- Cutleaf blackberry
- Dalmatian toadflax
- Diffuse knapweed
- Dyer's woad
- Egeria
- Eggleaf spurge
- Eurasian watermilfoil
- European mountain-ash
- False brome
- Floating primrose-willow
- Flowering rush
- Fragrant water lily
- Garden loosestrife
- Garlic mustard
- Giant hogweed
- Goatsrue
- Gorse
- Green alkanet
- Hanging sedge
- Hairy Willow-herb
- Hawkweed, Meadow subgenus
- Hawkweed, Wall subgenus
- Herb Robert
- Himalayan blackberry
- Horse chestnut
- Houndstongue
- Hydrilla
- Invasive knotweeds
- Jubata grass
- Kochia
- Kudzu
- Large and hybrid bindweed
- Leafy spurge
- Lesser celandine
- Meadow knapweed
- Milk thistle
- Multiflora rose
- Musk thistle
- Myrtle spurge
- Nonnative cattails
- Norway maple
- Old man's beard
- Orange candleflower
- Orange hawkweed
- Orange peel clematis
- Oxeye daisy
- Pampas grass
- Parrotfeather
- Perennial pepperweed
- Perennial sowthistle
- Phragmites
- Poison hemlock
- Policeman's helmet
- Purple loosestrife
- Reed canarygrass
- Reed sweetgrass
- Ricefield bulrush
- Rough chervil
- Rush broom
- Rush skeletonweed
- Saltcedar
- Scentless mayweed
- Scotch broom
- Shiny geranium
- Silver lace vine
- Small-flowered jewelweed
- Soft broom
- Spotted jewelweed
- Spotted knapweed
- Spurge laurel
- St. Johnswort
- Sulfur cinquefoil
- Tall buttercup
- Tall hawkweed
- Tansy ragwort
- Tree of heaven
- Tussilago
- Velvetleaf
- Ventenata
- Vested blackberry
- Water primrose
- White cockle
- Wild basil
- Wild carrot
- Wild chervil
- Yellow archangel
- Yellow flag iris
- Yellow floating heart
- Yellow hawkweed
- Yellow nutsedge
- Yellow starthistle
- Yellow toadflax
Search/Filter Dropdown
Select the scientific name of a noxious weed to view a page with detailed information about the weed.
- Abutilon theophrasti
- Acer platanoides
- Aegopodium podagraria
- Aesculus hippocastanum
- Ailanthus altissima
- Alliaria petiolata
- Anthriscus caucalis
- Anthriscus sylvestris
- Artemisia absinthium
- Arum italicum
- Bassia scoparia
- Brachypodium sylvaticum
- Buddleia davidii
- Butomus umbellatus
- Carduus nutans
- Carex pendula
- Centaurea diffusa
- Centaurea macrocephala
- Centaurea x moncktonii
- Centaurea solstitialis
- Centaurea stoebe
- Chaerophyllum temulum
- Chondrilla juncea
- Cirsium arvense
- Cirsium vulgare
- Clematis orientalis
- Clematis vitalba
- Clinopodium vulgare
- Conium maculatum
- Cortaderia jubata
- Cortaderia selloana
- Crataegus monogyna
- Crupina vulgaris
- Cynoglossum officinale
- Cyperus esculentus
- Cytisus scoparius
- Daphne laureola
- Daucus carota
- Dipsacus fullonum
- Echium vulgare
- Egeria densa
- Epilobium hirsutum
- Euphorbia myrsinites
- Euphorbia oblongata
- Euphorbia virgata
- Fallopia baldschuanica
- Fallopia spp.
- Ficaria verna
- Foeniculum vulgare
- Galega officinalis
- Genista monspessulana
- Geranium lucidum
- Geranium robertianum
- Glyceria maxima
- Hedera helix
- Heracleum mantegazzianum
- Hieracium, subgenus Hieracium
- Hieracium, subgenus Pilosella
- Hieracium aurantiacum
- Hieracium caespitosum
- Hieracium lachenalii
- Hieracium piloselloides
- Hieracium sabaudum
- Hydrilla verticillata
- Hypericum perforatum
- Hypochaeris radicata
- Ilex aquifolium
- Impatiens capensis
- Impatiens glandulifera
- Impatiens parviflora
- Iris pseudacorus
- Isatis tinctoria
- Jacobaea vulgaris
- Lamiastrum galeobdolon
- Lepidium latifolium
- Leucanthemum vulgare
- Linaria dalmatica ssp. dalmatica
- Linaria vulgaris
- Lotus corniculatus
- Ludwigia hexapetala
- Ludwigia peploides
- Lysimachia vulgaris
- Lythrum salicaria
- Myriophyllum aquaticum
- Myriophyllum spicatum
- Nymphaea odorata
- Nymphoides peltata
- Onopordum acanthium
- Pentaglottis sempervirens
- Phalaris arundinacea
- Phragmites australis
- Polygonum sp.
- Polygonum aubertii
- Potamogeton crispus
- Potentilla recta
- Prunus avium
- Prunus laurocerasus
- Pueraria montana var. lobata
- Ranunculus acris
- Ranunculus repens
- Robinia pseudoacacia
- Rosa multiflora
- Rubus bifrons
- Rubus laciniatus
- Rubus vestitus
- Salvia sclarea
- Senecio vulgaris
- Silene latifolia
- Silybum marianum
- Solanum dulcamara
- Solanum rostratum
- Sonchus arvensis
- Sorbus aucuparia
- Spartina
- Spartium junceum
- Tamarix ramosissima
- Tanacetum vulgare
- Tripleurospermum inodorum
- Tussilago farfara
- Ulex europaeus
- Ventenata dubia
