On the day of mango planting, there is a custom of cooking plums in southern China, mainly to introduce solar terms for mango planting.

1. It is an ancient custom to "cook plums" in the awn seed season. The main purpose of "cooking plums" in southern China on this day is to remove the sour taste of plums and make them taste better. "Boiling plums" means boiling plums with rock sugar. Some people will add salt to plums to make sour plum soup.

2. Ear planting is the ninth solar term in the twenty-four solar terms, the third solar term in summer and the beginning of noon month in the dry calendar. The yellow meridian of the sun reaches 75 degrees, which is celebrated on June 5-7 of the Gregorian calendar every year. "awn seed" means "grain crops with awns can be planted, and they will become invalid after planting" This season, the temperature rises obviously, the rainfall is abundant and the air humidity is high, which is suitable for planting cereal crops such as late rice. Agricultural planting is bounded by the solar term "awn seed", and the survival rate of planting has become lower and lower since then. It is the reflection of ancient farming culture in festivals.

3. The solar term of awn species is of great significance in agriculture. The book of the lunar calendar says, "The bucket refers to the awn seed. At this time, there are awn valleys to plant, and after that, it will be invalid, hence the name." This means that the solar term of canopy is suitable for planting grain crops with canopy; It is also the dividing point of the timing of planting crops, and it will be invalid after that. The folk proverb "It's no use planting awns again" tells this truth. Mango is a solar term for busy farming, which is also called "busy planting" by the people. This season is the time to plant rice in the south and harvest wheat in the north.