What does Grain Rain mean in solar terms?

Beginning of spring, Qingming, Rain, Equinox and Grain Rain are six solar terms.

. Grain Rain: There's a fight. The meridian of the sun is 30 degrees. It means that rain breeds grain. Because rain nourishes the earth, five grains can grow, so Grain Rain is "rain gives birth to hundreds of grains". As the saying goes, "Before and after Grain Rain, you reap what you sow".