Why not say March spring, April spring?

Yangchun March refers to the March of the lunar calendar.

It's April.

Liu An in the Han Dynasty said in Huai Nan Zi: "After the vernal equinox ... the wind will clear up after the fifteenth finger." Tomb-Sweeping Day comes in March in spring, so "Tomb-Sweeping Day" is also called "March Festival".

In the spring of March, it means that the weather is completely new, and the beautiful scenery in the lake is suddenly released. Luoqi is full of sanhua, and Zhao dances in the clouds. In May, the lotus girl in the lake smiled at the lotus.