Canada Thistle

Cirsium arvense

  • A perennial that spreads by roots and seeds
  • Grows 1 to 4 feet tall
  • Has clusters of small, white to purple flowers at the end of the stems
  • Leaves are very spiny – it hurts to touch this weed!
  • Grows in moist and disturbed sites
  • This invasive weed is very aggressive and difficult to control
  • Pulling and burning do not control this weed, as they favor root resprouting
  • Chemical controls are needed