Selecting land and fertilizing: selecting fertile loam or sandy loam; Seed treatment: soak the seeds in warm water 3-5 days before sowing15-20 hours. Take it out and put it in a cloth bag or container, place it at 25 to 30 degrees Celsius, accelerate germination, and sow when one third of the seeds turn white; Sowing: Generally, drill sowing is adopted, a sowing ditch with a depth of 3 cm and a row spacing of 25-30 cm is drawn and watered. After the water seeps out, the seeds are evenly spread into the ditch, then covered with fine sand, and then covered with a film after sowing; Transplanting and planting: when the seedling height is 10 cm and the leaves are 8-9, transplanting and planting can be carried out; Fertilizer and water management: apply sufficient base fertilizer before planting; Leaf picking and ventilation: remove some leaves at the base of seedling stem to reduce darkness, which is beneficial to ventilation and tenderness and cultivate strong seedlings.