12 days. The maturity of golden corn in Changshu, Jiangsu Province is 1 to 12 days. Corn is mainly divided into spring sowing and summer sowing, and the harvest time is different with different sowing time. It takes 1 to 12 days for medium-mature corn to grow from sowing to maturity in spring and 85 to 95 days in summer. Jiangsu, referred to as "Su" for short, is a provincial administrative region of the People's Republic of China. Nanjing, the provincial capital, is located in the Yangtze River Delta and the eastern coast of Chinese mainland.