Species:
Musk thistle (Carduus nutans)
Growth Form: Biennial
Key Identifying Characteristics: large spiny bracts tending the flower head; deep green foliage; leaves with light colored mid-vein and margins
Reproduction: Seed
Seed Longevity: 10 or more years
Native To: Eurasia
Effective Control Methods: Mechanical; herbicide; biocontrol; anything that prevents seed production.