All 53 species on Utah's official noxious weed list, with identification photos, bloom times, habitat information, and control methods.
Crupina vulgaris
Common crupina is a highly competitive winter annual that invades rangelands, pastures, an…
Peganum harmala
African rue is a toxic perennial shrub native to the Mediterranean region. It is highly to…
Anchusa arvensis
Small bugloss is an annual or biennial plant from Europe that invades agricultural fields,…
Salvia aethiopis
Mediterranean sage is a biennial or short-lived perennial that forms large rosettes in its…
Milium vernale / Ventenata dubia
Ventenata (North Africa grass) is an annual grass that invades rangelands and reduces fora…
Zygophyllum fabago
Syrian beancaper is a perennial shrub from the Middle East that invades arid and semi-arid…
Carduus acanthoides
Plumeless thistle is a biennial or annual thistle from Europe that invades pastures, roads…
Centaurea melitensis
Malta starthistle is an annual or biennial plant from the Mediterranean that invades range…
Alhagi maurorum
Camelthorn is a deep-rooted perennial shrub from the Middle East that is extremely difficu…
Alliaria petiolata
Garlic mustard is a biennial herb that invades forest understories, riparian areas, and di…
Centaurea calcitrapa
Purple starthistle is a biennial or short-lived perennial from the Mediterranean that inva…
Galega officinalis
Goatsrue is a federally listed noxious weed native to Europe that is highly toxic to lives…
Brassica tournefortii
African mustard is an annual plant from the Mediterranean that invades desert and semi-ari…
Arundo donax
Giant reed is one of the world's most invasive plants. It forms massive, impenetrable stan…
Echium vulgare
Viper's bugloss is a biennial or short-lived perennial from Europe that invades roadsides,…
Brassica elongata
Elongated mustard is an annual or biennial plant from Eurasia that invades roadsides, rang…
Hypericum perforatum
Common St. Johnswort is a perennial herb from Europe that invades rangelands, roadsides, a…
Leucanthemum vulgare
Oxeye daisy is a perennial herb from Europe that invades meadows, roadsides, and disturbed…
Scorzonera laciniata
Cutleaf vipergrass is a biennial or perennial plant from Europe that invades rangelands, r…
Euphorbia esula
Leafy spurge is one of the most economically damaging invasive plants in the western Unite…
Taeniatherum caput-medusae
Medusahead is an annual grass from Eurasia that is one of the most problematic invasive gr…
Chondrilla juncea
Rush skeletonweed is a perennial plant from Eurasia that invades rangelands, roadsides, an…
Centaurea stoebe
Spotted knapweed is one of the most widespread invasive plants in the western United State…
Lythrum salicaria
Purple loosestrife is a perennial wetland plant from Europe that forms dense monocultures …
Centaurea virgata
Squarrose knapweed is a perennial plant from the Middle East that invades rangelands and r…
Isatis tinctoria
Dyer's woad is a biennial or short-lived perennial from Eurasia that was historically used…
Centaurea solstitialis
Yellow starthistle is an annual plant from the Mediterranean that is one of the most probl…
Linaria vulgaris
Yellow toadflax (butter-and-eggs) is a perennial plant from Eurasia that invades rangeland…
Centaurea diffusa
Diffuse knapweed is a biennial or short-lived perennial from Eurasia that invades rangelan…
Hyoscyamus niger
Black henbane is a highly toxic annual or biennial plant from Eurasia. All parts of the pl…
Linaria dalmatica
Dalmatian toadflax is a perennial plant from the Mediterranean that invades rangelands, ro…
Acroptilon repens
Russian knapweed is one of the most difficult invasive plants to control due to its deep, …
Cynoglossum officinale
Houndstongue is a biennial plant from Europe that invades rangelands, forests, and roadsid…
Lepidium latifolium
Perennial pepperweed is a highly invasive plant from Eurasia that forms dense stands in we…
Phragmites australis ssp.
The invasive subspecies of common reed forms dense monocultures in wetlands and riparian a…
Tamarix ramosissima
Tamarisk is a shrub or small tree from Eurasia that has invaded riparian areas throughout …
Cardaria spp.
Hoary cress is a perennial plant from Eurasia that invades agricultural fields, roadsides,…
Cirsium arvense
Canada thistle is one of the most widespread and economically damaging invasive plants in …
Conium maculatum
Poison hemlock is one of the most toxic plants in North America. All parts are highly pois…
Carduus nutans
Musk thistle is a biennial plant from Eurasia that invades rangelands, roadsides, and dist…
Elymus repens
Quackgrass is a perennial grass from Eurasia that invades agricultural fields, roadsides, …
Aegilops cylindrica
Jointed goatgrass is an annual grass from Eurasia that is a serious problem in winter whea…
Cynodon dactylon
Bermudagrass is a perennial grass from Africa that invades agricultural fields, roadsides,…
Sorghum halepense / Sorghum almum
Johnson grass is a tall perennial grass from the Mediterranean that invades agricultural f…
Onopordum acanthium
Scotch thistle is one of the largest thistles in the world, reaching up to 9 feet tall. It…
Convolvulus spp.
Field bindweed is one of the most persistent and difficult-to-control weeds in agricultura…
Tribulus terrestris
Puncturevine is an annual plant from the Mediterranean that is a serious problem for lives…
Imperata cylindrica
Cogongrass is considered one of the world's worst invasive plants. It forms dense monocult…
Euphorbia myrsinites
Myrtle spurge is a succulent perennial plant from the Mediterranean that was widely sold a…
Hesperis matronalis
Dame's rocket is a biennial or short-lived perennial from Eurasia that was widely sold as …
Cytisus scoparius
Scotch broom is a perennial shrub from Europe that was widely planted for erosion control …
Elaeagnus angustifolia
Russian olive is a small tree or large shrub from Eurasia that was widely planted for wind…
Polygonum cuspidatum
Japanese knotweed is one of the world's most invasive plants. It forms dense thickets that…