Prohibited Noxious Weeds

The weeds in the prohibited noxious class are those which are known to pose an intolerable economic threat to production, recreation or the general environment, and the degree of infestation is such that eradication is physically and economically feasible.

When prohibited noxious weeds are involved, the Vegetation Management Technicians are obligated to inventory the designated species, to map the locations and issue a notice to destroy. The Vegetation Management Technicians are to advise the Director of Agricultural Services and then monitor the site regularly to ensure that the directives of the notice are carried out. If there is non‑compliance, they are obligated to contact the Director of Agricultural Services so as to initiate legal action or cause the work to be done and have all costs charged against the land involved. Further, continued surveillance by the Vegetation Management Technicians can be anticipated for several years to ensure that there are no recurrences of growth of the weed.

The Weed Control Act stipulates that a person shall destroy a prohibited noxious weed that is on land the person owns or occupies.

For more information on these weeds, please check out the fact sheets from the Alberta Invasive Plants Network.

Autumn Olive Big Head Knapweed Common Barberry Common Buckthorn Common St John's Wort Diffuse Knapweed Dodder Dyer's Woad Eurasian Water Milfoil Flowering Rush Garlic Mustard Giant Hogweed Giant Knotweed

Mouse-ear Hawkweed Nodding Thistle Orange Hawkweed Pale Yellow Iris Plumeless Thistle Puncturevine Purple Loosestrife Red Bartsia Rush Skeletonweed Russian Knapweed Salt Cedar Saltlover Scentless Chamomile