This Noxious Weed List contains information about Idaho’s noxious weeds. Just click on the name of a weed you want to learn more about. You will be given the best control methods available to manage that weed. Idahoans can contact their County Weed Control Superintendent or a Private Applicator for technical assistance in dealing with the control and management of noxious weeds.
PLEASE NOTE – The proper use and application of herbicides can be an effective way to control and eradicate noxious and invasive plants. Before using herbicides, always carefully follow the label and safety instructions on the label. While we recommend the use of herbicides as one of the effective tools for integrated pest management, the Idaho Weed Awareness Campaign assumes no liability for herbicide application.
Black Henbane
Hyoscyamus niger
Bohemian Knotweed
Polygonum bohemicum
Brazilian Elodea
Egeria densa
Buffalobur
Solanum rostratum
Canada Thistle
Cirsium arvense
Common Crupina
Crupina vulgaris
Common/European Frogbit
Hydrcharis morsus-ranae
Common Reed (Phragmites)
Phragmites australis
Curlyleaf Pondweed
Potamogeton crispus
Dalmatian Toadflax
Linaria genistifolia ssp. dalmatica
Diffuse Knapweed
Centaurea diffusa
Dyer’s Woad
Isatis tinctoria
Eurasian Watermilfoil
Myriophyllum spicatum
Fanwort
Cobomba caroliniana
Feathered Mosquito Fern
Azolla pinnata
Field Bindweed
Convolvulus arvensis
Flowering Rush
Butomus umbelltus
Giant Hogweed
Heracleum mantegazzianum
Giant Knotweed
Polygonum sachalinense
Giant Salvinia
Salvinia molesta
Hoary Alyssum
Berteroa incana
Hoary Cress (Whitetop)
Lepidium draba ssp. draba
Houndstongue
Cynoglossum officinale
Hydrilla
Hydrilla verticillata
Iberian Starthistle
C. iberica
Japanese Knotweed
Polygonum cuspidatum
Johnsongrass
Sorghum halepense
Jointed Goatgrass
Aegilops cylindrica
Leafy Spurge
Euphorbia esula
Matgrass
Nardus stricta
Meadow Hawkweed
Hieracium caespitosum
Meadow Knapweed
Centaurea debeauxii
Mediterranean Sage
Salvia aethiopis
Milium
Milium vernale
Musk Thistle
Carduus nutans
Orange Hawkweed
Hieracium aurantiacum
Oxeye Daisy
Chrysanthemum leucanthemum
Parrotfeather Milfoil
Myriophyllum aquaticum
Perennial Pepperweed
Lepidium latifolium
Perennial Sowthistle
Sonchus arvensis
Plumeless Thistle
Carduus acanthoides
Poison Hemlock
Conium maculatum
Policeman’s Helmet
Impatiens glandulifera
Puncturevine
Tribulus terrestris
Purple Loosestrife
Lythrum salicaria
Purple Starthistle
Centaurea calcitrapa
Rush Skeletonweed
Chondrilla juncea
Russian Knapweed
Acroptilon repens
Saltcedar
Tamarix ssp.
Scotch Broom
Cytisus scoparius
Scotch Thistle
Onopordum acanthium
Small Bugloss
Anchusa arvensis
Spotted Knapweed
Centaurea stoebe ssp. micranthos
Squarrose Knapweed
Centaurea triumfetti
Syrian Beancaper
Zygophyllum fabago
Tall Hawkweed
Hieracium piloselloides
Tansy Ragwort
Senecia jacobaea
Variable Leaf Milfoil
Myriophyllum heterophyllum
Vipers Bugloss
Echium vulgare
Water Chestnut
Trapa natans
Water Hyacinth
Eichhornia crassipes
White Bryony
Bryonya alba
Yellow Devil Hawkweed
Hieracium glomeratum
Yellow Flag Iris
Iris psudocorus
Yellow Floating-Heart
Nymphoides pelata
Yellow Star Thistle
Centaurea solstitialis
Yellow Toadflax
Linaria vulgaris