Walnut is a Juglans plant of Juglandaceae. Together with almonds, cashews and hazelnuts, it is called the world-famous "four dried fruits". Walnut kernel is rich in nutrients, and contains many trace elements and minerals such as calcium, phosphorus and iron, as well as many vitamins such as carotene and riboflavin.
Walnut trees have strong adaptability, few pests and diseases, labor-saving management, convenient storage and transportation of fruits and long service life. Walnut trees like temperature and light, and have strict requirements on water, especially in the new shoot growth period and fruit development period, and need sufficient water supply, so they should be planted in sandy loam with loose structure, good water retention and ventilation.
China is one of the centers of origin of walnuts in the world, with the largest walnut production in the world, the largest planting area and output, and the second largest export volume after the United States.