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Island County > Public Health > Natural Resources > Noxious Weed Control Board > Noxious Weed Pictorial Index - 2018

​Noxious Weed Pictorial Index - 2018


Island County property owners are:

Required to eradicate the Regulated Class A Noxious Weeds.

Click on images to learn more.

Spartina anglica
cordgrass, common
Spartina anglica
Spartina densiflora
cordgrass, denseflowered
Spartina densiflora
Alliaria petiolata
garlic mustard
Alliaria petiolata
giant hogweed
giant hogweed
Heracleum mantegazzianum
bighead knapweed
knapweed, bighead
Centaurea macrocephala
Meadow Clary
meadow clary
Salvia pratensis
purple starthistle
Purple starthistle
Centaurea calcitrapa
Clary Sage
sage, clary
Salvia sclarea
Spanish broom
Spanish broom
Spartium junceum
Milk Thistle
thistle, milk
Silybum marianum



Required to control the Regulated Class B Noxious Weeds and asked to control the Non-Regulated Class B Noxious Weeds.

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Brazilian elodea
Brazilian elodea
Egeria densa
butterflybush
butterflybush
Buddleja davidii
common fennel
common fennel
Foeniculum vulgare
Common Reed
common reed (non-native genotypes)
Phragmites australis
Dalmatian toadflax
Dalmatian toadflax
Linaria dalmatica ssp. dalmatica
Eurasian watermilfoil
Eurasian watermilfoil
Myriophyllum spicatum
gorse
Gorse
Ulex europaeus
hairy willowherb
hairy willowherb
Epilobium hirsutum
hawkweed, orange
hawkweed, orange
Hieracium aurantiacum

Hawkweed, yellow
Hieracium caespitosum
herb-Robert
herb-Robert
Geranium robertianum
knapweed, brown
knapweed, brown
Centaurea jacea
knapweed, diffuse
knapweed, diffuse
Centaurea diffusa

knapweed, meadow
knapweed, meadow
Centaurea jacea x nigra
knapweed, spotted
knapweed, spotted
Centaurea stoebe
knotweed, Bohemian
knotweed, Bohemian
Polygonum x bohemicum
knotweed, giant
knotweed, giant
Polygonum sachalinense
knotweed, Himalayan
knotweed, Himalayan
Polygonum polystachyum
knotweed, Japanese
knotweed, Japanese
Polygonum cuspidatum
loosestrife, purple
loosestrife, purple
Lythrum salicaria
parrotfeather
parrotfeather
Myriophyllum aquaticum
poison hemlock
poison hemlock
Conium maculatum
Scotch broom
 Scotch broom
Cytisus scoparius

spurge laurel
spurge laurel
Daphne laureola
sulfur cinquefoil
sulfur cinquefoil
Potentilla recta
tansy ragwort
tansy ragwort
Senecio jacobaea
thistle, musk
thistle, musk
Carduus nutans
velvetleaf
velvetleaf
Abutilon theophrasti
wild chervil
wild chervil
Anthriscus sylvestris
yellow archangel
yellow archangel
Lamiastrum galeobdolon 



Required to control the Regulated Class C Noxious Weeds and asked to control the Non-Regulated Class C Noxious Weeds.

Click on images to learn more.

bull thistle
bull thistle
Cirsium vulgare
Canada thistle
Canada thistle
Cirsium arvense
absinth wormwood
absinth wormwood
Artemisia absinthium
babysbreath
babysbreath
Gypsophila paniculata
buffalobur
buffalobur
Solanum rostratum
common catsear
common catsear
Hypochaeris radicata
common groundsel
common groundsel
Senecio vulgaris
common St. Johnswort
common St. Johnswort
Hypericum perforatum
common tansy
common tansy
Tanacetum vulgare
common teasel
common teasel
Dipsacus fullonum
curlyleaf pondweed
curlyleaf pondweed
Potamogeton crispus
English ivy – four cultivars only
English ivy – four cultivars only 
Hedera helix ‘Baltica’, ‘Pittsburgh’, and ‘Star’
H. hibernica ‘Hibernica’

evergreen blackberry
evergreen blackberry
Rubus laciniatus
field bindweed
field bindweed
Convolvulus arvensis
Himalayan blackberry
Himalayan blackberry
Rubus armeniacus
Italian arum
Italian arum
Arum italicum
Japanese eelgrass
Japanese eelgrass
Zostera japonica
jubata grass
jubata grass
Cortaderia jubata
old-man’s-beard
old-man’s-beard
Clematis vitalba
oxeye daisy
oxeye daisy
Leucanthemum vulgare
pampas grass
pampas grass
Cortaderia selloana
reed canarygrass
reed canarygrass
Phalaris arundinacea
scentless mayweed
scentless mayweed
Matricaria perforata
smoothseed alfalfa dodder
smoothseed alfalfa dodder
Cuscuta approximata
wild carrot
wild carrot
Daucus carota 
yellowflag iris
yellowflag iris
Iris pseudacorus
yellow toadflax
yellow toadflax
Linaria vulgaris


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