High slopes with high temperatures and even rainfall, especially high temperatures, dryness, adequate sunlight and a cloudy night climate are ideal. The desirable temperature is 27-30°c, the upper limit is 40°c, the lower limit is 16°c, the difference between day and night should not exceed 7-10°c and the appropriate annual rainfall is 1200-1,800. They are more resilient, infertile, drought-resistant and flood-prone, but they are growing with a high growth capacity and wide range of adaptations. They can be grown in sandy, sandy land that is loose, well drained, low and fertile in groundwater, and in poorly drained, often humid areas. It is less resistant to cold and prone to physico-folic diseases。