Under the dual effects of topography and climate, Chongqing is foggy and is known as the foggy city. The main crops are black tomatoes, longan and ramie. Chongqing is also one of the important producing areas of Chinese herbal medicines in China. There are thousands of wild and cultivated Chinese herbal medicines growing in a large area of mountainous areas. In China, honeysuckle, Eucommia bark, coptis root, gallnut, magnolia bark, phellodendron bark and corydalis tuber are the most abundant.

The ideal soil for black tomato is sandy loam and clayey sandy loam with deep and fertile soil layer, good drainage, considerable water and fertilizer conservation and soil pH value in the range of 5.6~6.7. Black tomato is a treasure in tomato family, which has rich fruit fragrance, high nutritional value and very sweet taste. Especially suitable for fresh food. It contains lycopene, vitamin C and antioxidants which are 10 times higher than those in red tomatoes, and is easily absorbed by human body. Black tomato contains a lot of anthocyanins, which can produce strong biological effects in human body and have anti-cancer effect; It also contains a lot of lycopene, vitamin C and antioxidants, which has the functions of nourishing yin, protecting kidney, whitening and losing weight for women.

Longan is a subtropical fruit tree, which likes high temperature and high humidity. Temperature is the main factor affecting its growth and results. Generally speaking, longan can grow and develop well where the annual average temperature exceeds 20℃. Longan is drought-resistant, acid-resistant and barren, so it is forbidden to soak. It grows well in hilly red soil and dry land, is easy to cultivate, has long service life, high yield and great economic benefits, and is well received by the people. Longan is rich in glucose, sucrose and protein. And its iron content is relatively high. It can promote the regeneration of hemoglobin while improving heat energy and supplementing nutrition, thus achieving the effect of enriching blood. Studies have found that longan meat is not only beneficial to the whole body, but also particularly effective for brain cells, which can enhance memory and eliminate fatigue.

Ramie is one of the important fiber crops in ancient China, a national treasure of China and unique to China. China's ramie production accounts for more than 90% of the world's ramie production, and it is internationally known as China Grass. Ramie is a treasure all over the body, and its root is diuretic and antipyretic, which has the function of protecting the fetus; Leaves are used as hemostatic agents to treat traumatic bleeding; Root and leaf combined treatment of acute gonorrhea, urethritis bleeding; Young leaves can be used to raise silkworms and make feed; Seeds can be used to extract oil, make soap and eat. Ramie can also be used to treat common cold and fever, measles and high fever, urinary tract infection, nephritis and edema, abdominal pain of pregnant women, restless fetal movement, threatened abortion, traumatic injury, fracture swelling and pain, hemorrhagic diseases and other diseases.

Honeysuckle is adaptable, sunny, shade-tolerant, cold-resistant, drought-resistant, and wet. The requirements for soil are not strict, but it grows best on moist and fertile deep sandy soil. Hair twice a year, twice in spring and summer. The root system is dense and developed, with strong germination, and the stems and vines can take root when they touch the ground. Born in hillside thickets or sparse forests, stone piles, foothills and village fences, the highest altitude is 1500m. Honeysuckle has been famous for its extensive medicinal value since ancient times. Its efficacy is mainly to clear away heat and toxic materials, and it is mainly used to treat fever, bloody dysentery due to toxic heat, carbuncle and furuncle. In addition, it can enhance immunity, resist early pregnancy, protect liver, resist tumor, diminish inflammation, relieve fever, stop bleeding and inhibit the absorption of cholesterol in intestine.

Eucommia ulmoides Oliv Like warm and humid climate and sunny environment, can resist the cold, and can survive normally at -30℃. It can be cultivated in most parts of China and has strong adaptability. There is no strict requirement on the choice of soil, but loam with deep, loose, fertile, moist and well-drained soil layer is the most suitable. Eucommia ulmoides Oliv It can regulate the immune system, endocrine system, central nervous system, circulatory system and urinary system to varying degrees. Eucommia ulmoides Oliv It can excite pituitary-adrenal cortex system and enhance adrenal cortex function.