Legend has it that on the first day of the twelfth lunar month, it was snowing in Chang 'an, Xijing, and Wu Zetian wrote a poem while drinking: "I swam to the Ming Garden, and I had to wait for the breeze to blow." Hundreds of flowers are awed by this fate and open overnight, but peony is not out of season and flowers can't open. In a rage, Wu Zetian expelled the peony from Chang 'an, sent it to Luoyang and burned it at the stake. Peony suffered this disaster and was in a state of anxiety; However, the roots and branches are not scattered, they stand still in the cold and cold. When the spring breeze blows in the coming year, the flowers will bloom more brightly, which is called "burnt peony".