First, plant ash can be used to make lunar calendar.

In ancient times, women didn't have sanitary napkins to use when they came to their period. plant ash can play this role. Plant ash's water absorption function is very good. plant ash is wrapped in two pieces of cotton cloth, which can be used when she comes to her period. Then, when replacing it, you just need to throw away the plant ash in the lunar calendar belt. Ordinary people generally use plant ash, and only aristocratic families can use cotton. 　

Second, plant ash can be used for cleaning.

Plant ash is actually the ashes left by burning some grass and wood. Ancient people didn't have shampoo and soap. plant ash was originally an alkaline substance. Gleditsia sinensis used for washing hair and bathing in ancient times was made of plant ash. It can not only remove stains, but also nourish hair.

Third, plant ash can be used as fertilizer.

When the ancient people planted crops, the fertilizer was not particularly sufficient, so the simplest fertilizer was plant ash. It can not only protect water and resist drought, but also help to reduce water loss in crops because plant ash is rich in potassium. It can improve the harvest.

Fourthly, plant ash can be used to make food.

In fact, although plant ash looks gray and black, it is particularly unclean. But in fact, plant ash is edible. Ancient people used plant ash to make zongzi during the Dragon Boat Festival, and it is very common for plant ash to make wine.

Fifth, plant ash can be used as a dye.

In ancient times, when people were short of dyes, they would use common plant ash to dye cloth, and generally gray cloth would appear. This is the simplest dye, but because of its low cost, it is also the most commonly used dye by ordinary people.