The first known reference to boiling tea came from the Han dynasty work "The Contract for a Youth" written by Wang Bao where, among the tasks listed to be undertaken by the youth, "he shall boil tea and fill the utensils" and "he shall buy tea at Wuyang". The first record of cultivation of tea also dated it to this period (Ganlu era of Emperor Xuan of Han) when tea was cultivated on Meng Mountain (蒙山) near Chengdu. From the Tang to the Qing dynasties, the first 360 leaves of tea grown here were picked each spring and presented to the emperor. Even today its green and yellow teas, such as the Mengding Ganlu tea, are still sought after.