Like cool, cold, drought, heat and waterlogging, it is suitable for planting in sandy loam with deep soil layer, rich humus and strong water permeability. Strong saline-alkali soil is not suitable for planting. The vertical growth of roots can reach more than 1 m, which is commonly known as "zaobianqi". Soil sticky roots grow slowly and are deformed; The soil layer is thin, with many roots and branches, which is a "chicken claw" with poor quality. Avoid continuous cropping, and it is not suitable to rotate with potatoes and flax. The hard rate can reach 30%-60%. In the first year of direct seeding, only stems and leaves grow, and flowers and seeds can be produced in the second year without flowering.