Seedling cultivation and then transplanting, seedling cultivation time in late May to early June; The seedbed should be selected in a high elevation position; The growth temperature should be kept at about 20 ~ 25, and the soil should be kept moist; The growth period should be topdressing 3 to 4 times to ensure the nutrients required for growth. Planting time: The general planting time is around August to September every year, and very few areas are planted in March every year.