Synonym like mushrooms after rain:

A thousand miles a day, increasing day by day

Like mushrooms after rain

[ Pinyin] [yǔ hòu chūn sǔn]

[ Interpretation] It means that after the spring rain, bamboo shoots grow a lot at once. Metaphor things emerge quickly and in large numbers.

[ Source] Song Zhang Lei's poem "Eating Bamboo Shoots" reads: "The barren forest is full of spring rain, and new bamboo shoots are sprouting."