Prohibited Noxious

Prohibited noxious species with demonstrated detrimental effects in other provinces or states but not established in Alberta. The objective is to prevent the establishment of prohibited noxious weeds in Alberta

  • Autumn olive
  • Himalayan balsam
  • Common barberry
  • Red bartsia
  • Common buckthorn
  • Sulphur cinquefoil
  • Common crupina
  • Dyer’s woad
  • Eurasian water milfoil
  • Flowering rush
  • Garlic mustard
  • Jointed goatgrass
  • Meadow hawkweed
  • Mouse-ear hawkweed
  • Orange hawkweed
  • Hoary alyssum
  • Giant hogweed
  • Pale yellow iris
  • Bighead knapweed
  • Black knapweed
  • Brown knapweed
  • Diffuse knapweed
  • Hybrid knapweed
  • Meadow knapweed
  • Russian knapweed
  • Spotted knapweed
  • Squarrose knapweed
  • Tyrol knapweed
  • Giant knotweed
  • Hybrid Japanese knotweed
  • Japanese knotweed
  • Purple loosestrife
  • Medusahead
  • Yellow nutsedge
  • Puncturevine
  • Tansy ragwort
  • Rush skeletonweed
  • Saltcedar
  • Saltlover
  • Common St. John’s wort
  • Yellow starthistle
  • Chinese tamarisk
  • Smallflower tamarisk
  • Marsh thistle
  • Nodding thistle
  • Plumless thistle

Noxious Weeds

Noxious weeds are widely spread but can still pose significant economic hardship once established. The objective is to protect those who do not have these weeds from infestation

  • Common baby’s-breath
  • Field bindweed
  • Creeping bellflower
  • Blueweed
  • Downy brome
  • Japanese brome
  • Great burdock
  • Lesser burdock
  • Wooly burdock
  • Tall buttercup
  • Scentless chamomile
  • Yellow clematis
  • White cockle
  • Oxeye daisy
  • Dame’s rocket
  • Black henbane
  • Globe-podded hoary cress
  • Heart-podded hoary cress
  • Lens-podded hoary cress
  • Hound’s tongue
  • Common mullein
  • Broad-leaved pepper-grass
  • Field scabious
  • Perennial sow thistle
  • Leafy spurge
  • Common tansy
  • Canada thistle
  • Dalmation toadflax
  • Yellow toadflax
  • **NEW** Tall Buttercup/Ox eye Daisy Control Policy
  • Fact sheet on Giant Hogweed with Cow Parsnip
  • Words from Woodlands – Knocking Out Thistles
  • Learn about the Stem-Mining Weevil of Canada Thistle

The County prevents the spread of prohibited noxious and noxious weeds as defined by the Weed Control Act, Weed Designation Regulation (Alberta Regulation 19/2010) and as may be amended by local bylaw or ministerial order. The following are the prohibited noxious and noxious weeds as currently defined under the Weed Control Act.

Learn more about weeds through Alberta Agriculture