Bermudagrass Johnsongrass Medusahead Quackgrass Field Bindweed Hoary Cress Diffuse Knapweed Russian Knapweed Spotted Knapweed Squarrose Knapweed Purple Loosestrife Perennial Pepperweed Leafy Spurge Yellow Starthsitle Canada Thistle Musk Thistle Scotch Thistle Dyer's Woad Back to main weeds page   Bull Thistle Cirsium vulgare   Rosette Leaves are highly lobed, prickly on upper surface, and cottony underneath. Adult This biennial can grow from two to five feet tall supported by a short fleshy taproot. Flower Flowers are one and one-half to two inches wide and are pinkish-purple. Weed Infestation Bull thistle is native to Europe. It now infests much of North America. It is often found in pastures, fields, roadsides, and disturbed sites. It is most common in lower, heavier soils, and moist areas. Seed Seeds are topped by a circle of plume-like white hairs. Back to main weeds page   Buffalobur Common Burdock Camelthorn Goatsrue Jointed Goatgrass Poison Hemlock Black Henbane Houndstongue Blue-Flowering Lettuce Western Whorled Milkweed Silverleaf Nightshade Yellow Nutsedge Puncturevine Russian-Olive Saltcedar St. Johnswort Bull Thistle Dalmatian Toadflax Yellow Toadflax Velvetleaf