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Utah's noxious weeds

Every weed on Utah's noxious weed list, with photos, descriptions and control notes. Search by common or scientific name, or filter by class.

Noxious weed, defined

A noxious weed, harmful weed or injurious weed is a weed that has been designated by an agricultural or other governing authority as a plant that is injurious to agricultural or horticultural crops, natural habitats or ecosystems, or humans or livestock.

Most noxious weeds have been introduced into an ecosystem by ignorance, mismanagement or accident. Some noxious weeds are native. Typically they are plants that grow aggressively, multiply quickly without natural controls, and display adverse effects through contact or ingestion. Many arrived through contaminated shipments of feed and crop seed, or were intentionally introduced as ornamental plants for horticultural use.

Noxious weeds are a large problem in many parts of the world, greatly affecting agriculture, forest management, nature reserves, parks and other open space.

Adapted from Wikipedia: Noxious weed

Browse the weeds

69 entries

Aceria malherbae - Biocontrol Biocontrol Aceria malherbae Biological control agent African Mustard - 1B 1B African Mustard Brassica tournefortii African Rue - 1A 1A African Rue Peganum harmala Agonopterix alstromeriana - Biocontrol Biocontrol Agonopterix alstromeriana Biological control agent Aphthona czwalinae - Biocontrol Biocontrol Aphthona czwalinae Biological control agent Aulacidea acroptolonica - Biocontrol Biocontrol Aulacidea acroptolonica Biological control agent Bermudagrass - Class 3 Class 3 Bermudagrass Cynodon dactylon Black Henbane - Class 2 Class 2 Black Henbane Hyoscyamus niger Camelthorn - 1B 1B Camelthorn Alhagi maurorum Canada Thistle - Class 3 Class 3 Canada Thistle Cirsium arvense Cogongrass - Class 4 Class 4 Cogongrass Imperata cylindrica Common Crupina - 1A 1A Common Crupina Crupina vulgaris Common St. Johnswort - 1B 1B Common St. Johnswort Hypericum perforatum Cutleaf Vipergrass - 1B 1B Cutleaf Vipergrass Scorzonera laciniata Cyphocleonus achates - Biocontrol Biocontrol Cyphocleonus achates Biological control agent Dalmatian Toadflax - Class 2 Class 2 Dalmatian Toadflax Linaria dalmatica Damesrocket - Class 4 Class 4 Damesrocket Hesperis matronalis Diffuse Knapweed - Class 2 Class 2 Diffuse Knapweed Centaurea diffusa Dyers Woad - Class 2 Class 2 Dyers Woad Isatis tinctoria Elongated Mustard - 1B 1B Elongated Mustard Brassica elongata Eustenopus villosus - Biocontrol Biocontrol Eustenopus villosus Biological control agent Field Bindweed - Class 3 Class 3 Field Bindweed Convolvulus arvensis Galerucella spp. - Biocontrol Biocontrol Galerucella spp. Biological control agent Garlic Mustard - 1B 1B Garlic Mustard Alliaria petiolata Giant Reed - 1B 1B Giant Reed Arundo donax Goatsrue - 1B 1B Goatsrue Galega officinalis Hadroplontus litura - Biocontrol Biocontrol Hadroplontus litura Biological control agent Hoary Cress - Class 3 Class 3 Hoary Cress Cardaria draba Houndstongue - Class 3 Class 3 Houndstongue Cynoglossum officinale Hylobius transversovittatus - Biocontrol Biocontrol Hylobius transversovittatus Biological control agent Jaapiella invannikovi - Biocontrol Biocontrol Jaapiella invannikovi Biological control agent Japanese Knotweed - 1B 1B Japanese Knotweed Polygonum cuspidatum Jointed Goatgrass - Class 3 Class 3 Jointed Goatgrass Aegilops cylindrica Larinus minutus - Biocontrol Biocontrol Larinus minutus Biological control agent Leafy Spurge - Class 2 Class 2 Leafy Spurge Euphorbia esula Malta Starthistle - 1A 1A Malta Starthistle Centaurea melitensis Mecinus janthiniformis - Biocontrol Biocontrol Mecinus janthiniformis Biological control agent Mediterranean Sage - 1A 1A Mediterranean Sage Salvia aethiopis Medusahead - Class 2 Class 2 Medusahead Taeniatherum caput-medusae Musk Thistle - Class 3 Class 3 Musk Thistle Carduus nutans Myrtle Spurge - Class 4 Class 4 Myrtle Spurge Euphorbia myrsinites Oberea erythrocephala - Biocontrol Biocontrol Oberea erythrocephala Biological control agent Oxeye Daisy - 1B 1B Oxeye Daisy Leucanthemum vulgare Perennial Pepperweed - Class 3 Class 3 Perennial Pepperweed Lepidium latifolium Perennial Sorghum Species - Class 3 Class 3 Perennial Sorghum Species Sorghum halepense Phragmites - Class 3 Class 3 Phragmites Phragmites australis Plumeless Thistle - 1A 1A Plumeless Thistle Carduus acanthoides Poison Hemlock - Class 3 Class 3 Poison Hemlock Conium maculatum Puccinia punctiformis - Biocontrol Biocontrol Puccinia punctiformis Biological control agent Puncturevine - Class 3 Class 3 Puncturevine Tribulus terrestris Purple Loosestrife - Class 2 Class 2 Purple Loosestrife Lythrum salicaria Purple Starthistle - 1B 1B Purple Starthistle Centaurea calcitrapa Quackgrass - Class 3 Class 3 Quackgrass Elymus repens Rush Skeletonweed - Class 2 Class 2 Rush Skeletonweed Chondrilla juncea Russian Knapweed - Class 3 Class 3 Russian Knapweed Acroptilon repens Russian Olive - Class 4 Class 4 Russian Olive Elaeagnus angustifolia Saltcedar - Class 3 Class 3 Saltcedar Tamarix ramosissima Scotch Broom - Class 4 Class 4 Scotch Broom Cytisus scoparius Scotch Thistle - Class 3 Class 3 Scotch Thistle Onopordum acanthium Small Bugloss - 1A 1A Small Bugloss Anchusa arvensis Spotted Knapweed - Class 2 Class 2 Spotted Knapweed Centaurea stoebe Spring Milletgrass - 1A 1A Spring Milletgrass Milium vernale Squarrose Knapweed - Class 2 Class 2 Squarrose Knapweed Centaurea virgata Syrian Beancaper - 1A 1A Syrian Beancaper Zygophyllum fabago Urophora cardui - Biocontrol Biocontrol Urophora cardui Biological control agent Ventanata - 1B 1B Ventanata Ventenata dubia Vipers bugloss - 1B 1B Vipers bugloss Echium vulgare Yellow Starthistle - Class 2 Class 2 Yellow Starthistle Centaurea solstitialis Yellow Toadflax - Class 2 Class 2 Yellow Toadflax Linaria vulgaris

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