Canada Thistle
Cirsium arvense

Weed Infestation
Canada Thistle infestation
A native to southeastern Eurasia, Canada thistle reproduces by seeds and rootstock. It is adaptable to a diverse range of habitats.
Adult
Canada Thistle adult
Canada thistle is a perennial plant usually from one to four feet tall, in sparse to extremely dense colonies.
Rosette
Canada Thistle rosette
Leaves have spiny tipped lobes.
Flower
Canada Thistle flower
Flowerheads are softly spined, light pink to purple to white, and are typically three-quarter inch in diameter. Bloom occurs in July and August.
Seed
Canada Thistle seed
Seed is attached to a soft parachute-like plume.
 
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