These can get to be 9 feet tall. All parts were used medicinally — leaves, roots, flowers, and seeds. One way to distinguish it from common burdock is that the flowers are on little stalks, whereas in common burdock the flowers cluster directly on the main stem. Aster family. Native to Europe, Asia. Cultivated in Japan because they like to eat it, especially the roots, julienned and braised with a sauce or pickled in sushi, or as a snack chip.
Great Burdock, Beggar’s Buttons (Arcticum lappa)
Bonus: Most of these are purple, but there was also a white one: