Herbs are generally small in size, short in life and weak in stems, and most of them die at the end of the growing season. According to the length of years to complete the whole life history, it can be divided into annual, biennial and perennial herbs.
Use of Herbs: (1) Many important edible plants of human beings are derived from herbs, such as wheat, millet, corn, barley, sorghum, rice, etc., which can be eaten by human beings. (2) Herbs are also an important part of the earth's food chain. They are not only food for humans and animals, but also produce a lot of oxygen to prevent soil erosion.