Cirsium arvense - Canada thistle

Dates are provided with each image to indicate the time of year flowers, seed, etc. are developing.



Mature habit
08/11/2003
Foliage
03/23/2003
Habit
08/12/2003
Flowers and seed
08/12/2003
Pappus formation
08/12/2003
Problematic in nursery stock
08/29/2003
Underside of foliage
03/23/2003
Rosettes ready for clopyralid
04/13/2003
Flower buds
05/19/2003
Flower head
06/01/2003
Flower heads
06/11/2003
Field in bloom
07/02/2003

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