2. Dig pits according to the row spacing of 40 cm and the plant spacing of 25 cm, put 2-3 seeds in each pit, cover with soil and water, and generally germinate in 7- 10 days. During the growth of seedlings, it is necessary to do a good job of thinning and replenishing seedlings, intertillage weeding and topdressing. Finally, pay attention to insect prevention.