However, from the results of cultivation experiments, it is appropriate to shade in front and sun in the back, and the shading degree in seedling stage should be controlled above 70% ~ 80%; After the seedling is grown, it is controlled at about 30%. As a deep-rooted plant, the fleshy roots can reach more than 1 m in the soil, which requires a deep, loose, fertile soil layer, rich humus and well-drained slightly acidic sand or loam. If the soil is barren and dry, the plants grow poorly, and the roots are thin, the yield is low and the quality is poor.