Herbs are made from plant extracts, mainly for their therapeutic value. Because most plants contain chemical elements, there are physical treatments such as healing.
Herbs are the oldest form of health care and played an important role in ancient times. Today, with the development of modern medicine, it was still unheard of at the beginning.
According to a study by the World Health Organization, about 80% of the world's population still relies on herbal medicines to treat a certain disease, and about 74% of the medicines we use today contain at least one botanical molecule.

Cannabis (scientific name: Cannabis sativa L.) is a cannabis plant of the Moraceae family, an annual upright herb, 1 to 3 meters high. Branches with longitudinal grooves, densely grayish-white appressed hairs. Leaves palmately divided, lobes lanceolate or linear-lanceolate, especially the dried flowers and trichomes of female plants. Cannabis cultivation can be stripped and harvested. There are females and males. The male plant is called Chi, and the female plant is called Ju.
Cannabis was originally distributed in India, Bhutan and Central Asia, and is now wild or cultivated in various countries. It is also cultivated or reduced to wild in various parts of China. Common wild in Xinjiang.
Its main effective chemical component is tetrahydrocannabinol (THC for short), which has mental and physiological activities after smoking or oral administration.
The bark fiber of this species is long and tough, and can be used for weaving linen or spinning, making ropes, weaving fishing nets and making paper; the seeds are pressed for oil, with an oil content of 30%, which can be used for paints, coatings, etc., and the oil residue can be used as feed. The fruit is called "hemp seed" or "hemp seed" in traditional Chinese medicine. The flower is called "Mabo", which treats bad wind, amenorrhea, and forgetfulness. The leaves contain anesthetic resins for the preparation of anesthetics.

The leaves are the vegetative organs of higher plants, and the sides develop from the leaf primordium of the stem of the plant. The leaves contain chloroplasts, which are the main organs for photosynthesis in plants. At the same time, the transpiration of plants is also achieved through the stomata of leaves. Leaves can come in all different shapes, sizes, colors and textures.
Leaves appear only on true stems, i.e. only vascular plants have leaves. All higher plants such as ferns, gymnosperms, and angiosperms have leaves. In contrast, bryophytes, algae, fungi and lichens have no leaves. Only leaf-like structures can be found in these flat bodies (Thallus), but only as analogs (Analoga).
Leaves can come in all different shapes, sizes, colors and textures. Leaves can be clustered or scattered all over the place. The edges of the leaves can be smooth or serrated. A complete leaf consists of the following three parts: The leaves are mostly broad and flat, suitable for sunlight. The petiole supports the leaf and connects the leaf to the stem. Stipules protect young leaves. (Some plants have no stipules, and some have stipules that fall off very early.)

Hundreds of flowers are edible, but few of them are widely promoted as food, often just for coloring and dressing salads. Pumpkin flowers can be dipped in bread crumbs and fried, and other edible flowers include watercress, chrysanthemum, carnation, cattail, honeysuckle, endive, cornflower, canna, and sunflower, to name a few. Some edible flowers can also be processed into preserves, such as chrysanthemums, roses and pansies.
Flowers can also be used to brew scented tea, using the characteristics of tea to absorb odors, the fragrant flowers are stuffed with the new tea, the tea absorbs the fragrance and then the dried flowers are sieved, including jasmine tea, magnolia tea, pearl orchid tea, etc.

The leaves of Moringa oleifera were dried by sun drying, hot air drying, hot air drying after greening, far-infrared drying, microwave drying and heat pump drying. The results showed that the effects of the six drying methods on the appearance and quality of Moringa oleifera leaves were significantly different. The heat pump drying method had the least impact, followed by hot air drying and sun drying. Although the heat pump drying time is relatively long, it maintains the best content of fat and polysaccharide in Moringa oleifera leaves, and also has a significant impact on other nutrients, which is the most suitable drying method for Moringa oleifera leaves.

Tea leaves, commonly known as tea, generally include the leaves and buds of the tea tree. Tea ingredients include catechin, cholestene, caffeine, inositol, folic acid, pantothenic acid, which are beneficial to health. The tea beverage made from tea leaves is one of the three major beverages in the world.
Tea originated in China, and tea was first used as a sacrifice. However, it has been used as a vegetable food by people since the late Spring and Autumn Period, developed for medicinal purposes in the middle of the Western Han Dynasty, and developed into a high-level court beverage in the late Western Han Dynasty. The earliest remains of artificially planted tea were found at the Tianluoshan site in Yuyao, Zhejiang, with a history of more than 6,000 years. Tea drinking started in China. The leaves are leathery, oblong or oval, and can be directly soaked in boiling water. They are divided into six categories according to the variety, production method and product shape. According to the season, it can be divided into spring tea, summer tea, autumn tea and winter tea. Reprocessing various kinds of hair tea or refined tea leaves to form re-adding tea, including scented tea, pressed tea, extracted tea, medicinal health tea, tea food, tea-containing beverage, etc.