What does the proverb "Spring thunder makes everything grow" mean?

"Spring thunder, everything grows" means: when it thunders in spring, it will rain in spring, which moistens everything, so everything grows and there will be a good harvest in the next year.

Proverbs refer to the solar term of fright, which reflects the phenomenon that natural creatures germinate and grow under the influence of rhythm changes. Speaking of earthquakes, the sun's spirit rises, the temperature warms up, the spring thunder suddenly moves, the rain increases, and everything is full of vitality. Judging from the natural phenology and climate process in various parts of China, "the beginning of thunder" only coincides with the natural rhythm in some parts of southern China.