The origin of Grain Rain is as follows:

Grain Rain is the sixth of the twenty-four solar terms, the last solar term of spring, and is celebrated on the 19th - 21st day of the fourth month of the Gregorian calendar every year. The arrival of the Grain Rain Festival means that the cold weather is basically over and the temperature picks up faster, which is greatly conducive to the growth of cereal crops.

One, the origin of the valley rain:

The origin of the valley rain in the ancient books is explained in this way, "the month of seventy-two waiting collection," said, "the middle of March, since the rain, the soil anointing pulse, and now the rain of its valley in the water, too, cover the valley at this time to sow seeds from the bottom up, so it got its name."

The meaning of this sentence is that in the middle of March, after the rain made the land fertile and suitable for the sowing of crops such as grains, and after the sowing came the rainfall of the new season, which was suitable for the growth of grains. Therefore, the sowing of cereals in the future in this season, the two things from the bottom up to have "grain rain" the name of the festival.

Anciently, Guyu linked grain and rain, implying the meaning of "rain produces hundreds of grains" and reflecting the agro-climatic significance of "Guyu".

Second, the rain of the valley of the "three waiting"

Each festival has three representative of the weather, the rain of the valley of the three waiting is:

The first wait for the beginning of the ping:

The ping refers to the pimpernel, pimpernel plants are grown in the water, and can not withstand frost, so to the valley of the rain season! The temperature rises with enough rain, the duckweed will get a suitable environment to start growing.

Second Waiting Turtle Dove:

The turtle dove here refers to the cuckoo bird. The song dove brushes its feathers means that the cuckoo bird starts to comb its feathers. Because the cuckoo can sense the changes in the weather, once the temperature is right it will come to live in the north and start grooming its feathers to start courting. The temperature during the rainy season is just right for the cuckoo, so there is a saying that the turtledove brushes its feathers during the rainy season.

Third Waiting for Dai Sheng to descend on Mulberry:

Here, "Dai Ren" means Dai Sheng bird, and "Mulberry" means mulberry tree. Because the rainy season is the time for the Dai Sheng bird to breed, and its nest is built on the mulberry tree. Therefore, there is the phenomenon that the bird descends on the mulberry tree in the rainy season.