Canada thistle

Asterales > Asteraceae > Cirsium arvense (L.) Scop.
Synonym(s): Californian thistle, creeping thistle, field thistle

Identification, Biology, Control and Management Resources

  • Fact Sheet - Pennsylvania Dept. of Conservation and Natural Resources
    http://www.dcnr.state.pa.us/forestry/invasivetutorial/canada_thistle.htm -
  • Weed of the Week - USDA Forest Service
    http://www.na.fs.fed.us/fhp/invasive_plants/weeds/canadian-thistle.pdf - Nov 7, 2006

Selected Images from Forestry Images

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Number:5270081
Description: Foliage;
Photographer:Leslie J. Mehrhoff, University of Connecticut
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Number:1358355
Description: Foliage;
Photographer:Mary Ellen (Mel) Harte,
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Number:1459758
Description: Flower(s);
Photographer:Steve Dewey, Utah State University
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Number:1459761
Description: Flower(s); Purple and (rare) white flowers in the same field
Photographer:Steve Dewey, Utah State University
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Number:1334022
Description: Flower(s); In a forested setting. South Dakota
Photographer:Chris Evans, River to River CWMA
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Number:1358360
Description: Flower(s);
Photographer:Mary Ellen (Mel) Harte,
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Number:5230083
Description: Flower(s); Female flower heads
Photographer:Richard Old, XID Services, Inc.
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Number:1196013
Description: Flower(s);
Photographer:Michael Shephard, USDA Forest Service
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Number:5230085
Description: Flower(s); Male flower heads
Photographer:Richard Old, XID Services, Inc.
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Number:5230086
Description: Flower(s); Male flower heads
Photographer:Richard Old, XID Services, Inc.
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Number:5230084
Description: Fruit(s);

Female flower heads

Photographer:Richard Old, XID Services, Inc.
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Number:1237095
Description: Plant(s);
Photographer:Dan Tenaglia, Missouriplants.com
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Number:1358350
Description: Plant(s);
Photographer:Mary Ellen (Mel) Harte,
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Number:1265114
Description: Plant(s);
Photographer:Peggy Greb, USDA Agricultural Research Service
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Number:1358358
Description: Plant(s);
Photographer:Mary Ellen (Mel) Harte,
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Number:1196252
Description: Plant(s);
Photographer:UAF Cooperative Extension Archive, University of Alaska - Fairbanks
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Number:1196009
Description: Infestation;
Photographer:UAF Cooperative Extension Archive, University of Alaska - Fairbanks
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Number:1459754
Description: Infestation; In a pasture
Photographer:Steve Dewey, Utah State University
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Number:1929056
Description: Infestation; in canola (Rape seed) field near Consort, Alberta
Photographer:Alec McClay, McClay Ecoscience
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Number:5307006
Description: Diagram or Graphic; USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service.
Photographer:USDA PLANTS Database, USDA NRCS PLANTS Database
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Number:5307004
Description: Diagram or Graphic; Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 553.
Photographer:USDA PLANTS Database, USDA NRCS PLANTS Database
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External Links

Subject Reference(s)

  • USDA, NRCS. 2001. The PLANTS Database, Version 3.1, National Plant Data Center, Baton Rouge, LA 70874-4490 USA. - http://plants.usda.gov/