Delaware Wildflowers • Months

Canada Thistle
Cirsium arvense
Asteraceae — Aster family
Invasive non-native
Canada Thistle
White Clay Creek State Park -- Possum Hill
June 2001
Canada Thistle
Prides Crossing
September 2009
Canada Thistle
White Clay Creek State Park -- Possum Hill
June 2011
Canada Thistle
White Clay Creek State Park -- Possum Hill
May 2020

Guide to Cirsium of Delaware

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Photos copyright David G. Smith

Information from the Delaware Flora Checklist used with author's permission.

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