Pengcao: It is a very small and light grass that floats around in the wind. Therefore, in ancient poetry, it is often used to describe the wandering life.
Such as : "Zheng Peng" means a flying Peng, a Peng flying far away. In ancient poetry, "Zheng Peng" symbolizes a wanderer from the far end of the world. A wanderer leaves his hometown and lives in another place, just like the roots of the grass are cut off; the wanderer has no fixed point in his travels and no fixed place to live. It is also like the wandering and helpless feeling of fluffy grass. Therefore, generally speaking, when poets are alone, or say goodbye to friends, lamenting that they or their friends have lost their lives, or missing their homes and friends, they use zhengpeng to express their feelings.
Example: Zheng Peng left Hansai, returned to Yan and entered Hutian.