Sometimes also known as the herb of medicine, it is a plant that gives off a distinctive scent, and is often used for flavoring, making spices, or extracting essential oils, and many of them have medicinal value. Although the so-called herb mainly refers to the leaves of green plants, but including flowers, fruits, seeds, bark, roots, etc., all parts of the plant may be used in medicine. Herbs are an important ingredient in traditional medicine around the world, providing most of the medicinal herbs that can be used to treat diseases. However, due to population growth and urban expansion, the natural environment for plant growth has been destroyed, and the rise of chemical pharmaceuticals, the use of herbs has been gradually declining in modern times.