Grain Rain before and after planting melons and beans, or before and after Qingming?

Spring Rain Starts Spring and Bright Valley Days: beginning of spring, Rain, Sting, Equinox, Qingming, Grain Rain.

Summer is full of mountains and summer is hot: long summer, small full, mangzhong, summer solstice, light summer and great summer.

Autumn dew autumn frost autumn: beginning of autumn, summer heat, dew, autumnal equinox, cold dew, first frost.

Winter snow is slightly cold in winter: beginning of winter, light snow, heavy snow, winter solstice, slight cold, severe cold.

Crops are usually sown after vernal equinox and before long summer, which should be combined with local climate characteristics and

The climate change of that year, so these two sentences are true, but maybe every place is different. After all, China is a vast country.