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A biennial thistle; stems are branching and woolly, covered in spines; leaves are lobed with prickles, and cottony hairs underneath. Flowers are pink to purple w/ spine-tipped bracts, flowering between June-September.
|Soil and Moisture Conditions
|Dig up at least the top couple inches of the root before the plant flowers. Cut twice per season to reduce population over time.
|Collect and destroy flowering stems. Do not compost or leave on the ground.
|Reproduction and Spread
|Reproduces by seeds. Contaminated hay spreads new plants. Cut stems can form viable seed.
|introduced from Europe and Asia.
|Canada thistle, Italian thistle, native thistles
|Colonizes disturbed sites and can form a monoculture of thistles; causes hay fever.