百日草为菊科百日草属一年生草本植物。茎直立,高30~100cm,被糙毛或长硬毛。叶宽卵圆形或长圆状椭圆形,头状花序。舌状花深红色、玫瑰色、紫堇色或白色,管状花黄色或橙色,先端裂片卵状披针形,上面被黄褐色密茸毛。花期5~9月,果期7~10月。百日草有单瓣、重瓣、卷叶、皱叶及各种不同颜色的园艺品种,在我国各地栽培很广。百日草对温度和日照长度 Zinnia for Asteraceae Zinnia is an annual herb. Stems erect, high 30 ~ 100cm, was rough or hirsute. Leaves broadly ovoid or oblong-elliptic, capitate. Lustrous flowers dark red, rosy, purple pansy or white, yellow or orange tubular flowers, apex lobes ovate-lanceolate, above the brown hair dense velvet. Flowering from May to September, fruit period from July to October. Zinnia have a single flap, double flap, roll leaf, leaves and a variety of different colors of horticultural varieties throughout China cultivation is very broad. Zinnia for temperature and sunshine length