The sowing time of sunflower seeds is generally in spring, summer and autumn, which is not suitable for sowing in winter. Because of the low temperature in winter, seedlings are easy to be frostbitten. General Jiangsu, Zhejiang and Shanghai areas in April for sowing, when the temperature is higher than 18 ℃, conducive to the growth of seedlings.
1. Pot soil preparation: sunflower is suitable to grow in loose and fertile soil. Generally, sandy soil can be used to mix and pile up fertile soil, and a small amount of river sand can be added to provide certain drainage. After that, water should be poured to provide a humid environment.
2. Seed selection: the seed of sunflower is very small, and it is not easy to distinguish its color, so it is generally unnecessary to select. If you want to improve its germination rate, you can properly soak seeds. Soak the seeds in clear water, take them out and dry in the shade after one day.
3. Sowing: flatten the surface of the basin. Then sprinkle the seeds on it and cover with a layer of fine soil. The thickness of the soil should not exceed two centimeters. After sowing, put it in a bright place.
4. Follow up maintenance: sunflower will germinate only when it is above 18 ℃, so the temperature must be well controlled. At the same time, the soil should be kept in a moist state, which is more conducive to germination. Can cover a layer of film, play the role of heat preservation and moisture.
