The short reed bud on the ground of Artemisia selengensis is exactly when the puffer fish wants to go up. What does it mean?

The beach is covered with Artemisia selengensis and reeds have sprouted. At this time, the puffer fish will swim back to the river from the sea. The poem Artemisia selengensis. The short buds on the ground are just the time when the puffer fish will come up. "It comes from Su Shi's Night Scene of the Spring River in Hui Chong in the Song Dynasty, which means that the beach is covered with Artemisia selengensis. Asparagus has also begun to sprout, and puffer fish will return to the river from the sea. By describing the characteristics of puffer fish swimming back, the whole poem injects the breath and vitality of spring. Two Nights on the Riverside is two poems written by Su Yuanfeng in eight years. By capturing the characteristics of the scenery when the seasons change, the poet presents a scene full of spring and prosperity, expressing his joy and praise for early spring. Su Shi, Zi Zi Zhan, Dao Tie Guan, Dongpo lay man, Meishan Meizhou, Northern Song Dynasty writer, calligrapher, historical water conservancy celebrity. His main works are Seven Episodes of Dongpo, Dongpo Yi Zhuan and Dongpo Yuefu.