What are the main producing areas of walnuts?

Walnuts love light, are cold-resistant, drought-resistant, and highly disease-resistant, and adapt to growing in a variety of soils. They prefer fertile, moist sandy loam, and like water, fertilizer, and sunlight, yet they are not strict about water and fertilizer requirements. After leaf drop and before bud break, pruning should not be done, as it easily causes bleeding. They are suitable for growing in most soils. They prefer fertile, moist sandy loam and are commonly found in mountainous areas along river valleys where the soil layer is deep.

Walnuts are produced in North China, Northwest China, Southwest China, Central China, South China, and East China, and **southern China. They are distributed in Central Asia, West Asia, South Asia, and Europe. They grow on mountain slopes and hilly areas at altitudes of 400-1800 m, and are commonly cultivated in plains and hilly areas of China.

Walnuts in China are widely distributed, found in 21 provinces (regions, municipalities) including Liaoning, Tianjin, Beijing, Hebei, Shandong, Shanxi, Shaanxi, Ningxia, Qinghai, Gansu, **, Henan, Anhui, Jiangsu, Hubei, Hunan, Guangxi, Sichuan, Guizhou, Yunnan, and Tibet. Inner Mongolia, Zhejiang, and Fujian and other provinces (regions) have small amounts of introduced or cultivated walnuts. The main producing areas are in Yunnan, Shaanxi, Shanxi, Sichuan, Hebei, Gansu, ** and other provinces (regions). Walnut is one of the most widely distributed economic tree species in China.

The horizontal distribution range of walnuts in China: from Mengla County, Yunnan at 21°08’32" N to ** Bole County at 44°54’ N, spanning 23°25’ in latitude; from Tashkurgan in ** at 75°15’ E to 124 E.