《旧唐书·本纪·卷十七》
吴、蜀进贡新茶，都是在冬季想办法催使茶叶提前生长得来的。文宗崇尚朴实，不愿违反植物生长规律，命令所进贡新茶，立春后祭祀之用。
故书，吴蜀贡新茶，皆于冬中作法为之，上务恭俭，不欲逆其物性，诏所供新茶，宜于立春后造。
Wu and Shu paid tribute to new tea, which was cultivated in winter by finding ways to make the tea leaves grow early. Wenzong advocated simplicity and was unwilling to violate the laws of plant growth. He ordered the new tea to be used for sacrifices after the beginning of spring.