Weeds

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.

Herbicide Carryover Concerns - Information by Year

Herbicide Carryover Considerations for 2019 (PDF 180 KB)

Weed Control Advice for Dry Conditions - May/June 2019 (PDF 116 KB)

Manitoba Weed Survey Results

Herbicide Resistant Weeds - Manitoba 2016 (PDF 8.4MB)

Manitoba Weed Survey - Annual Crops 2016 (PDF 9.4MB)

Manitoba Weed Survey - Annual Crops 2016 Summary poster (PDF 1.1MB)

 

Weed Species By Common NameBy Common Name
American Dragonhead Annual Sowthistle Barnyard Grass Bladder Campion Broad-Leaved Plantain Canada Thistle Chickweed Cleavers Cocklebur Common Burdock Common Groundsel Common Milkweed Cow Cockle Curled Dock Dandelion Diffuse Knapweed	Flixweed Foxtail Barley Green Foxtail Hemp-Nettle Kochia Lamb's Quarters Leafy Spurge Narrow-Leaved Hawk's Beard Night-Flowering Catchfly Nodding Thistle Perennial Sowthistle Pineapple Weed Prostrate Knotweed Purslane Quackgrass Red Root Pigweed Round-Leaved Mallow	Russian Thistle Scentless Chamomile Shepherd's Purse Smartweed Stinkweed Stork's Bill Volunteer Barley Volunteer Canola Volunteer Flax Volunteer Wheat White Cockle Wild Buckwheat Wild Mustard Wild Oats Yellow Foxtail Yellow Nutsedge

 

 Amaranth Family

• Red Root Pigweed

 

Buckwheat Family
Curled Dock Prostrate Knotweed	Smartweed Wild Buckwheat

  

Composite Family
Annual Sowthistle Canada Thistle Cocklebur Common Burdock	Common Groundsel Dandelion Diffuse Knapweed Narrow-Leaved Hawk's Beard	Nodding Thistle Perennial Sowthistle Pineapple Weed Scentless Chamomile

  

 Flax Family

• Volunteer Flax

 

Geranium Family

• Stork's Bill

 

Goosefoot Family

• Lamb's Quarters
• Russian Thistle

   

Grass Family
Barnyard Grass Green Foxtail Foxtail Barley	Quackgrass Volunteer Barley Volunteer Wheat	Wild Oats Yellow Foxtail

 

Madder Family

• Cleavers

 

Mallow Family

• Round-Leaved Mallow

 

Milkweed Family

• Common Milkweed

 

Mint Family

• American Dragonhead
• Hemp-Nettle

  

Mustard Family
Flixweed Shepherd's Purse	Stinkweed Volunteer Canola	Wild Mustard

 

 

Pink Family
Bladder Campion Chickweed	Cow Cockle Night-Flowering Catchfly	White Cockle

 

Plantain Family

•  Broad-Leaved Plantain

 

Purselane Family

• Purslane

 

Sedge Family

• Yellow Nutsedge

 

Spurge Family

• Leafy Spurge

 

Weed Management Facts

• Dandelion Control in the Fall
  
• Glyphosate Resistant Kochia
• Guide to Field Crop Protection
• Leafy Spurge - Integrated Management
• It's Probably Not Giant Hogweed - Poisonous Plant of the Carrot Family
• Red Bartsia Control
• Resistant Wild Mustard Increased
• Scouting for Weeds
• Spraying When It Pays: Applying Economic Thresholds to Weed Control
• Temperature and Quackgrass Control With Roundup
• Tillage - Comparing Zero and Conventional
• Weed Control Considerations for Early Seeded Crops
• Weed Control in Dry Weather
• Weed Control Efficiencies and Reduced Input Strategies
• Weed Control in Forage Crops
• Weed Control in Pastures
• Weed Management: Making It Work On Your Farm
• Weed Management in Organic Crop Systems