Also called Bull Thistle. A clumping biennial weed that forms a thick taproot during its first growing season. The leaves are covered with soft hairs along the leaf margins. Leaves of younger plants are less lobed than that of mature plants. The leaves are covered with very sharp needle like thorns. As the plant matures in its second season, if it has not been mowed it will produce a large spiky purple bloom. This weed can be controlled with Fertilome Weed out as a post emergent form of control.