Maotai has long swept away the moss-free flowers and trees and carried them by hand. Is this a poem describing the scenery of the Spring Festival?

Yes.

Correct your mistakes for reference:

"The eaves are always swept clean and free of moss, and the flowers and trees are planted by hand" comes from the ancient poem "Shu Huyin" by Wang Anshi, a poet of the Song Dynasty. The full text of the first and second sentences of "The Wall" is as follows:

Thatched eaves are often swept clean and free of moss, and flowers and trees are planted by hand to form a border.

A river of water protects the fields and surrounds them with green, and two mountains with rows of gates bring in green.