Scotch Thistle

Onopordum acanthium L.

  • A biennial weed that spreads by seed only
  • Grows up to 12 feet tall
  • Violet to reddish flowers are 1 to 2 inches in diameter
  • Stems have broad, spiny wings
  • Plant has a grayish appearance and is very spiny
  • Grows in along roadsides and in waste places and disturbed soils
  • Dig, removing the top two inches of root prior to seed set
  • Chemical controls are available