What is the application of the image of azaleas in ancient poetry?

In the poem Zigui written by Luo Yin in the Tang Dynasty, he said, "I hate the long way to go, and I will listen to it on my pillow. It is better to have a stone pile than to have a revenge. " "Tongliang Road is far from the grass, and I hate listening on my pillow." There is a saying that the cuckoo is wronged and flies everywhere until it is far from home. The poet runs around all day, and it is unbearable to hear the harsh cry of cuckoo in bed at night, which deeply causes the poet's inner pain.