| | Prohibited Noxious | Noxious | Weed Information Home Page
Weeds listed in the Alberta Weed Control Act are a threat to Alberta’s environment, economy and society. They have the potential to degrade habitiats, reduce biodiversity, increase erosion, cause widlfires, reduce property value, create obstacles to international trade and cause reduction in productivity of agricultural land.
Under the Alberta Weed Control Act, Prohibited Noxious weeds need to be destroyed and Noxious weeds need to be controlled. Please refer to Legislation link for a copy of the Act and for more information.
The best method of weed control is prevention. Please familiarize yourself with these weeds to avoid introductions and minimize spread on the land you own or occupy.
Prohibited Noxious
Aquatic | Grass | Herbs/Forbs | Ornamental | Tree/Shrub
Aquatic
Grass
Herbs/Forbs
Bartsia, red,
Odontites vernus (Bellardi) | Hoary alyssum,
Berteroa incana | Knapweed, Russian,
Rhaponticum repens | Ragwort, tansy,
Jacobaea vulgaris |
Cinquefoil, sulphur,
Potentilla recta | Hogweed, giant,
Heracleum mantegazzianum | Knapweed, spotted,
Centaurea stoebe ssp. micranthos | Rush skeletonweed,
Chondrilla juncea |
Crupina, common,
Crupina vulgaris | Knapweed, bighead,
Centaurea macrocephala | Knapweed, squarrose,
Centaurea virgata ssp. Squarrosa | Saltlover,
Halogeton glomeratus |
Dyer's woad,
Isatis tinctoria | Knapweed, black,
Centaurea nigra | Knapweed, Tyrol,
Centaurea nigrescens | St John's-wort, common,
Hypericum perforatum |
Garlic mustard ,
Alliaria petiolata | Knapweed, brown,
Centaurea jacea | Knotweed, giant,
Fallopia sachalinensis | Starthistle, yellow,
Centaurea solstitialis |
Hawkweed, meadow ,
Hieracium caespitosum | Knapweed, diffuse,
Centaurea diffusa | Knotweed, hybrid Japanese,
Fallopia × bohemica | Thistle, marsh,
Cirsium palustre |
Hawkweed, mouse-ear,
Hieracium pilosella | Knapweed, hybrid,
Centaurea × psammogena | Knotweed, Japanese,
Fallopia japonica | Thistle, nodding,
Carduus nutans |
Hawkweed, orange,
Hieracium aurantiacum | Knapweed, meadow,
Centaurea × moncktonii | Puncturevine,
Tribulus terrestris | Thistle, plumeless,
Carduus acanthoides |
Ornamental
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Tree/Shrub
Autumn olive,
Elaeagnus umbellata | Buckthorn, common,
Rhamnus cathartica | Saltcedar,
Tamarix ramosissima | Tamarisk, smallflower,
Tamarix parviflora |
Barberry, common,
Berberis vulgaris | Buckthorn, common,
Rhamnus cathartica | Tamarisk, Chinese,
Tamarix chinensis |  |
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