The links below will help you identify the most common weeds found in Manitoba. You can search by common name or family name.

Consult the weed management resources for information on cost-effective control.


Noxious Weeds in Manitoba - Declaration

Weed species in Manitoba are not all created equal. Specific weeds have been designated as 'Noxious' and have been categorized into different tiers based on their significant threat to agricultural primary production. Tier 1 weeds must be eradicated without conditions. Proper identification is important and control measures will depend on the species. Control of Tier 1 weeds is the landowners responsibility (e.g. farmer, company or Governemnt, including Manitoba Highways). The Provincial Mandate to control Noxious Weeds is through the Noxious Weeds Act, but implementation of the Act is at the Municipal or Weed Control District Level. See Manitoba Weed Supervisors Association website and the link to the Manitoba Weed Supervisor Weed Districts map.

Manitoba Noxious Weeds Distribution Maps

The maps below indicate the municipalities where these weeds have been found up to and including the 2023 crop season.

Palmer Amaranth Distribution - 2023

Smooth Pigweed Distribution - 2023

Waterhemp Distribution - 2023

Herbicide Carryover Concerns 

Herbicide Carryover Risk for 2021

Herbicide Spraying in Hot, Dry Conditions

Weed Control Advice for Dry Conditions - FAQ


Manitoba Weed Survey Results

Herbicide Resistant Weeds - Manitoba 2016 

Manitoba Weed Survey - Annual Crops 2016 

Manitoba Weed Survey - Annual Crops 2016 Summary poster 


Weed Species By Common Name


 Amaranth Family

Buckwheat Family


Composite Family


 Flax Family


Geranium Family


Goosefoot Family


Grass Family


Madder Family


Mallow Family


Milkweed Family


Mint Family


Mustard Family



Pink Family


Plantain Family


Purselane Family


Sedge Family


Spurge Family


Weed Management Facts