Idaho's 57 Noxious Weeds

Idaho has 57 different species of weeds which are designated noxious by state law. These weeds are designated into three levels of concern. The spread of these weeds and the damage they do to Idaho agriculture can be lessened through proper identification and handling.

Download a copy of Idaho's Official Noxious Weeds booklet **Files are large**

Part 1: Intro and A-O
Part 2: P-Z

Statewide EDRR List

Common Name Map Scientific Name
Brazilian Elodea
*
 Egeria densa P.
Giant Hogweed Heracleum mantegazzianum
Hydrilla Hydrilla verticillata
Policeman's Helmet Impatiens glandulifera
Squarrose Knapweed Centaurea squarrosa
Syrian Beancaper Zygophyllum fabago
Tall Hawkweed Hieracium piloselloides
Water Hyacinth Eichhornia crassipes M.
Yellow Devil Hawkweed Hieracium glomeratum

Statewide Control List

Common Name Map Scientific Name
Black Henbane Hyoscyamus niger
Bohemian Knotweed Polygonum bohemicum
Buffalobur Solanum rostratum
Common Crupina Crupina vulgaris
Dyer's Woad Isatis tinctoria
Eurasian Watermilfoil Myriophyllum spicatum
Giant Knotweed Polygonum sachalinesnse
Japanese Knotweed Polygonum cuspidatum
Johnsongrass Sorghum halpense
Matgrass Nardus stricta
Meadow Knapweed Centaurea pratensis
Mediterranean Sage Salvia aethiopis
Musk Thistle Carduus nutans
Orange Hawkweed Hieracium aurantiacum
Parrotfeather Milfoil Myriophyllum aquaticum
Perennial Sowthistle Sonchus arvensis
Russian Knapweed Acroptilon repens
Scotch Broom Cytisus scoparius
Silverleaf Nightshade Solanum elaegnifolium
Skeletonleaf Bursage Ambrosia tomentosa
Small Bugloss Anchusa arvensis
Toothed Spurge Euphorbia dentata
Vipers Bugloss Echium vulgare
Yellow Hawkweed Hieracium caespitosum

Statewide Containment List

Common Name Map Scientific Name
Canada Thistle Cirsium arvense
Dalmatian Toadflax Linaria genistifolia ssp. dalmatica
Diffuse Knapweed Centaurea diffusa
Field Bindweed Convolvulus arvensis
Hoary Alyssum Berteroa incana
Houndstongue Cynoglossum officinale
Jointed Goatgrass Aegilops cylindrica
Leafy Spurge Euphorbia esula
Milium Milium vernale
Oxeye Daisy Chrysanthemum leucanthemum
Perennial Pepperweed Lepidium latifolium
Plumeless Thistle Carduus acanthoides
Poison Hemlock Conium maculatum
Puncturevine Tribulus terrestris
Purple Loosestrife Lythrum salicaria
Rush Skeletonweed Chondrilla juncea
Saltcedar Tamarix
Scotch Thistle Onopordum acanthium
Spotted Knapweed Centaurea maculosa
Tansy Ragwort Senecio jacobaea
White Bryony Bryonia alba
Whitetop Cardaria draba
Yellow Starthistle Centaurea solstitialis
Yellow Toadflax Linaria vulgaris