Winter is coming quietly. In Dali Weishan Xiaoheqiao Ancient Tree Park, the red leaves of the ancient Pistacia trees, which are 100 to 400 years old, are swaying like blazing torches, reflecting the cold sky. The average age of the entire ancient tree group is more than 190 years old. There are 59 ancient trees such as Pistacia and Yunnan elm, the oldest of which is over 450 years old.