The poet created this beautiful artistic conception through anthropomorphic expression. Everything in poetry is full of life and emotion. This is because the author is so attached to the scenery in late spring. In his eyes, a hundred flowers blossom for spring and show people their charm in comparison. Even the unrealistic Huayang and Yugui are unwilling to lag behind, and they also turn into snowflakes and dance with the wind. So poetry is so interesting.
In late spring (Han Yu), every tree and grass knows that spring is coming back, and all kinds of reds and purples compete for Fang Fei. Even the fickle elm tree without beautiful colors is unwilling to be lonely, dancing with the wind and turning into snowflakes flying all over the sky. Flowers and trees know that spring will disappear, so they are full of brilliance; Catkin and elm lack talent and foresight, so they have to drift with the wind.
Personification rhetoric is to personify things, and turn things that have no human actions and feelings into things that have human actions and feelings (just like animals and plants in fairy tales can talk and laugh).
Personification means personifying things, that is, treating things as people and writing with feelings, language and actions like people. "Knowing War" is an anthropomorphic description of "vegetation" and "returning" is an anthropomorphic description of "spring", so it belongs to anthropomorphic techniques.