Canada thistle

(Cirsium arvense)

               
Conservation Status

IUCN Red List

not yet assessed

Canada thistle

NatureServe

NNA - Not applicable

SNA - Not applicable

Minnesota

not listed

Wetland
Indicator
Status

Great Plains

FACU - Facultative upland

Midwest

FACU - Facultative upland

Northcentral & Northeast

FACU - Facultative upland

Weed Status

SN – State noxious weed

PS – State prohibited weed seed

Invasive

Nativity

Native to western Asia and Europe. Introduced and naturalized in North America.

Photo by Bill Reynolds
Occurrence

Common and widespread

 
Habitat

Disturbed sites. Fields, pastures, roadsides, waste places.

 
Flowering

June to October

 
Flower Color

Pink

 
Height

12 to 48

 

Identification

 

 
Similar
Species

 

 
Pests and Diseases

PST (Pseudomonas syringae pv. tagetis) is a bacterum that infects the tips of Canada thistle plants. The plant tips cease producing chlorophyl (chlorosis) and have a white “bleached” appearance. Other symptoms are fewer shoots, stunted growth, inhibition of flowering and/or sterility. It is being considered as a natural control agent for Canada thistle. However, the bacterium also naturally infects common dandelion (Taraxacum officinale ssp. officinale), common sunflower (Helianthus annuus), common ragweed (Ambrosia artemisiifolia), giant ragweed (Ambrosia trifida var. trifida), and Jerusalem artichoke (Helianthus tuberosus), all found in Minnesota; and Aztec marigold (Tagetes erecta), French margiold (Tagetes patula), and globe artichoke (Cynara scolymus), not found in Minnesota.


Distribution Distribution Map  

Sources: 2, 3, 4, 5, 7, 22, 28.

This invasive plant is found in every county in Minnesota.


Comments

 


Taxonomy

Family:

Asteraceae (aster)

 

Subfamily:

Carduoideae

 

Tribe:

Cynareae

 

Subtribe:

Carduinae

 
Synonyms

Carduus arvensis

Cirsium arvense var. argenteum

Cirsium arvense var. horridum

Cirsium arvense var. integrifolium

Cirsium arvense var. mite

Cirsium arvense var. vestitum

Cirsium incanum

Cirsium setosum

Serratula arvensis

 
Common
Names

California thistle

Canada thistle

Canadian thistle

perennial thistle


 

 

 

 

 

 

 

 

 

       

Visitor Photos

   
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Bill Reynolds


My old field is about to burst out in thistle bloom. I know the Canadian Thistle is on the invasive list, but I let my bees work it then I start cutting the blooms from before they can go to seed.

  Canada thistle    

 

 

   
       
       

MinnesotaSeasons.com Photos

   

Plant

  Canada thistle    
       

Inflorescence

  Canada thistle   Canada thistle
       

Leaves

  Canada thistle    
       
       

 

Camera

     

Slideshows

   
  Creeping Thistle
Wez Smith
 
  Creeping Thistle  
 
About

Creeping Thistle (Cirsium arvense).

 
     
  Cirsium arvense
Matt Lavin
 
  Cirsium arvense  
 
About

Introduced rhizomatous perennial often about 1 m tall, with relatively small flowering heads (involucre less than 2 cm high), leaves not densely woolly on either the upper or lower surface, moist disturbed sites from low elevation open areas to open montane understory.

 
     
  Canada Thistle
Andree Reno Sanborn
 
  Canada Thistle  
 
About

Cirsium arvense

 
     
  Cirsium arvense FIELD THISTLE
Frank Mayfield
 
  Cirsium arvense FIELD THISTLE  

 

slideshow

     

Visitor Videos

   
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Other Videos

 
  Canada Thistle, identification of the Wisconsin Invasive Species Cirsium arvense
uwcoopextension
 
   
 
About

Uploaded on Jan 31, 2011

This is part of a series of videos providing key characteristics for the identification of invasive plants listed in Wisconsin's invasive species administrative rule NR 40. These videos are produced by Dr. Mark Renz of the University of Wisconsin-Madison. For more information on invasive plants and invasive plant management in Wisconsin visit http://ipcm.wisc.edu/Publications/WeedSciencepublications/tabid/116/Default.aspx

 
     
  Weed of the Week #597-Canada Thistle (From Ag PhD #597 9/13/09)
AgPhD
 
   
 
About

Uploaded on Sep 21, 2009

Good things from Canada: Rush, Justin Morneau, Tuquks. Bad things from Canada: Anne Murrary, Canada Thistle. Just kidding about Canada Thistle. We'll show you how to kill this weed in this week's weed of the week.

 
     
  Canada Thistle - Phenology Note w John Latimer
NowWatchingKAXE
 
   
 
About

Uploaded on Aug 11, 2009

KAXE Phenologist John Latimer talks about the Canada Thistle, one of two common types of tall thistle in Northern MN.

 
     
  The Invaders: Canada Thistle
UMDHGIC
 
   
 
About

Uploaded on Aug 13, 2009

Professional Horticulturist and Master Gardener Ellen Nibali identifies the Canada Thistle (cirsium arvense) and explains how to remove this invasive plant from your garden.

Click here to read our publication on invasive species for even more information: http://www.hgic.umd.edu/_media/documents/publications/hg88.pdf

This video is brought to you by the Home and Garden Information Center, part of University of Maryland Extension. Learn about our Grow It Eat It campaign, which provides resources and encourages people to start their own food gardens. http://www.growit.umd.edu/

Check out our facebook page for more gardening advice: http://www.facebook.com/UMDHGIC#!/GIEIMaryland

Intro Credit: "Invasion of the Body Snatchers: (1956); Allied Artists. Music and shot of woman screaming used here in accordance with Fair Use.

Shot and Edited by: Alix Watson and Emily Heimsoth

 
     

 

Camcorder

         

Visitor Sightings

   
Share your sighting of this plant.

Bill Reynolds
7/3/2014

Location: Pennington County

My old field is about to burst out in thistle bloom.  I know the Canadian Thistle is on the invasive list, but I let my bees work it then I start cutting the blooms from before they can go to seed.

Canada thistle


     
     
 

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