It is native to Europe, but was introduced accidentally into the eastern United States during the mid to late 1800s. Because of its prolific seed production and lack of natural enemies, it spread rapidly throughout much of North America. It is a weed of considerable economic importance in forage producing areas and has been declared a noxious weed in many states. Back To Top Characteristics Figure 1. Flowering musk thistle plant.
Flower color varies from purple to a deep reddish-pink.
Each flower head is located at the tip of a long stem or branch. The large flowers commonly grow to 2 inches in diameter, causing the stems to bend or nod-over as the flower matures. Musk thistle is also called nodding thistle. Leaves, stems and branches of musk thistle plants are covered with sharp spines. The long leaves are deeply and irregularly indented.