What is the meaning of "Mulberry" in ancient poetry?

In ancient times, mulberry trees and catalpa bungeana trees were often planted next to their houses. He also said that the mulberry trees in his hometown were planted by his parents, and we should pay tribute to them. Later generations used "mulberry" as a metaphor for hometown.

Wei Sang and Zi Shu must be respectful. -"Poetry, Xiaoya and Xiaoya"

Hometown of mulberry trees, hometown of parents.

Yisang

Mr. Shi is in his hometown. -The Scholar

"Poem Xiaoya Song" records: "Huai Sang and his son should respect each other. I am afraid of my father, but I am afraid of my mother. " It means that seeing mulberries can easily arouse nostalgia for their parents, so they feel respectful, and later generations take mulberries as the name of their hometown. For example, Liu Zongyuan, a great poet in the Tang Dynasty, wrote a sad sentence in Huang Wen Shi Li, "What are the birds from the countryside doing here? They miss mulberries in their hearts now."

Mulberry-hometown, hometown. In ancient times, people liked to plant mulberry trees and catalpa trees around their houses. Later, people used things instead of places and "mulberry" instead of hometown. Praise someone for the benefit of his hometown, often with "merit in mulberry."