The suitable time is spring and autumn, and the ground temperature is about 13 ℃. Therefore, spring can be carried out from January to February, and autumn can be carried out from July to August. The specific time can be adjusted in time according to the climate. If it is planted in a greenhouse, as long as the temperature is suitable
1. Seed selection: the seeds shall be selected before seedling raising. If the temperature in the region is relatively high, the varieties with better heat resistance shall be selected. On the contrary, if the temperature is low, choose the one with good cold resistance.
2. Seed soaking: soak in cold water for 2-3 minutes before seedling cultivation, then change to warm water for soaking, and remove and wash it after 15 minutes. Then put it in the wet cloth, put it in the place of 28 ℃, wash it for 4 hours, wait for it to germinate and then plant.
3. Soil preparation: the planting site should have good light, the soil should also be loose, and the thickness of the substrate should be about 5cm. After preparing the soil, we should apply some fertilizer in the soil, so that there is an appropriate amount of nutrients in the soil.
4. Sowing: cover the seeds with some soil after treatment, and then cover them with film, which can keep warm and moisturize. After it grows for a while, it will grow into seedlings.