Extremely variable in height and appearance, but grows easily to 7 feet tall, with hairy stems. Blooms July through November. Flowerheads of wild form are many per plant, with brown disks, and frequently with a double set of ray florets, commonly yellow. Large, with disk usually a couple inches in diameter not including the rays. Cultivated forms can be much larger, often with only one flowerhead per plant. Leaves are large, ovate to broad, with irregular, large teeth, mostly alternate except the uppermost ones. Lower leaves are usually heart-shaped. All leaves are rough and hairy.