Introduced from Eurasia, burdock prefers partially shaded areas, disturbed soils, waste areas, and is often found around livestock facilities
Widely dispersed invasive weed in all States
Burdock is not toxic but because of its spiny burs it can become attached to animals fur and cause trauma. Burs attached to eye lashes in horses can cause corneal ulcers. Sheep with burs in the wool bring reduced value to their fleece at shearing.
Burdock is a biennial, robust plant with stout taproot. Stems are erect, much branched, and reaching a height of 5-6 feet. Basal leaves are large (12inches wide, 24 inches long), heart- shaped, with stout hollow stems. Upper leaves are progressively much smaller. Characteristic flowers are produced in clusters at the ends of branches, and have petals that are pink, purple or occassionally white. The fruit is covered by stiff, hooked spines.