Primroses are cultivated by sowing, which is suitable for sowing from June to September. It can be planted at the end of June every year. In summer, the temperature is high and the survival rate of transplanted seedlings is low, so it needs to be maintained and managed in a cool place.
The temperature from August to September is not so high, so it's more convenient to breed at this time, but the development period of primrose is shorter, the plant growth is shorter, and the flowering period is shorter. At this time, if the breeding is not reasonable, the ornamental value of primrose will be reduced. Therefore, it is most appropriate to sow seeds directly when they are mature.
In potted primrose culture, the seeds should be evenly sown with fine sand, and then the smooth glass or template should be used to compact the surface, so as to facilitate the nutrient absorption and rooting of the seeds.
The seeds are too small. Do not cover the soil after sowing. Use the method of water soaking for irrigation. Immerse the basin soil in half of the water. Wait for the soil in the basin to be wet. Place it in a cool place and cover it with glass. It can germinate within two weeks, remove the glass, and gradually increase its photosynthesis.
The basin soil of primrose should be saprophytic soil, garden soil and mixed loam with a small amount of base fertilizer. The soil should be loose and fertile, with good ventilation and drainage, which is conducive to the development of roots.
When 2-3 true leaves grow out, the best choice is 7 cm basin diameter, which is suitable to wait for slow seedling, and then apply liquid fertilizer once a week. One and a half months later, replace the basin with 13-15 cm basin.
In the flowering period of primroses, thin liquid fertilizer should be applied once a week, and the soil should be kept moist, not too dry; in winter, the evaporation and absorption of the soil is too wet, which will lead to rotten roots of plants, so the watering of plants should be reduced.
It is more difficult for primroses to blossom in summer. If they want to continue to bloom in the next year, they should be kept safe under the moon. The plants after flower withering should be changed into pots and placed in a cool and ventilated place to prevent the sun and wind from blowing and reduce the amount of water. When the high temperature is hot, the ground should be watered to maintain a certain humidity, and then the next year for maintenance and flowering.
