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Sunflower is an annual herb. Stems erect, rounded and angular, hard and hard white. The broadly ovate leaves are usually alternate, apex acute or acuminate, with 3 base veins, margin serrate, rough on both sides, coat, long stalk. Flower heads, 10 to 30 cm in diam., solitary on culms or branches. The total sepals are multi-layered, leafy, imbricate, pubescent, flowering in summer, neutral yellow tongue-like flowers in inflorescence margins, not firm. The middle part of the inflorescence is a bisexual tubular flower, brown or purple, which is firm. Momented ovate achenes, woody, gray or black, called sunflower seeds. Sunflowers are available in all seasons, mainly in summer and winter. The flowering period can be more than two weeks.