BCP/Cirsium arvense

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Cirsium arvense

Heads

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Profile for Cirsium arvense (Canada Thistle)
Identifying Characteristics
Habit: Spreading herbaceous plant
Flowers: Heads
Foliage: Spiny
Stem: Spiny
Life Cycle: Perennial
Recent Logs[edit]

Global data:
Temperate zone season(s): Early Summer, Mid Summer, Late Summer, Early Fall

Regional data and additional images for Cirsium arvense

Regional data:
Southeastern Pennsylvania: (invasive or naturalized) June, July, August, September
New Hampshire: September
Central Pennsylvania: August, October

Additional images:

Please contribute!
This page is a profile for the plant species Cirsium arvense, used to collect records of where and when this plant was observed blooming, and for providing identification information for use in dichotomous keys. If you would like to help collect data for this or other plants, see Bloom clock project/How to Contribute for orientation.