Why are millet and wheat wrapped in hydrangeas?

The earliest recorded hydrangea in Guangxi contains crop seeds such as soybean, cotton seed or grain, which not only makes hydrangea have a certain weight and easy to throw, but also has a deeper meaning, that is, hydrangea is an "auspicious thing". Because Zhuang is a traditional rice-growing nation, they are very concerned about the annual harvest of crops. Therefore, in all kinds of rituals of offering sacrifices and praying for the New Year, crop seeds, sowing, farming and other forms of production and labor are often the themes of expression. There are grains in the hydrangea, which means that I hope that "five grains will be abundant" during the year; At the same time, hydrangea, as a love thing for young men and women, means "fertility prosperity".