3 Review(s)

Helianthus is an annual herb with a rough hairy stem that grows 3 to 15 feet tall and broad, coarsely toothed, rough leaves that are 3 to 12 inches long and spiraled.The attractive flower heads range in size from 7.5 to 15 cm in diameter. The petallike ray flowers are yellow, while the disk flowers are brown, yellow, or purple.The common sunflower is valuable both economically and in terms of ornamentation. Hybrid sunflowers have disease resistance.Sunflower seeds are particularly high in vitamin E and selenium, both of which are essential in the treatment of a variety of chronic diseases.