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Primroses are mainly propagated by seeds. Spring and autumn can be carried out. From March to May, the seedlings that grow in this way will bloom in the spring of the next year. Four seasons Primula more than sowing breeding. Spring and autumn can be carried out. The seeds of the four seasons Primula tend to lose their germination power, so they should be timely harvested in time. Generally, sowing is preferable when the temperature is moderate and the germination rate is high from August to September.
When sowing, it is better to use well-drained flowerpots and well-ventilated soils rich in peat moss and humus. The diameter of the soil pellet should be less than 6 cm. Put the box into the pot along 1.5 cm. The soil is best to pass through the sieve first, and the irrigated water, so that the water is completely infiltrated, and then the seeds and the fine sand uniformly spread on the soil.
The seeds of Primroses need light, so do not cover the soil after sowing, just gently press the seeds into the soil, cover the surface of the pot with glass or plastic film, keep it moist, and place it in the shade. The suitable temperature for seed germination of vernalization is 15 to 21°C, and if it exceeds 21%, the germination rate is significantly reduced, and even if it does not germinate, it should not be planted in summer.
The first transplant usually occurs after 6 weeks of infection. It can be placed in a shady greenhouse in a single pot or in 2 to 3 small pots with a diameter of about 7 mm. In hot summer seasons, if there is no temperature control equipment, you should choose to go to summer in a cool, ventilated place in the north. The ground on which the pots are placed should be covered with fine sand, moss, and other highly absorbent materials. After the water is sprayed, the water will slowly evaporate to increase the humidity of the surrounding air. Move into the greenhouse before the next frost. Finally, plant the planter with a diameter of 12 to 18 cm. It is advisable to use fertile soil rich in organic matter when planting, and appropriate slow-release fertilizers such as manure and bone meal. After every two weeks, thin fertilizer solution is applied once. Usually, we should keep the soil moist, but we should not be in a state of water saturation for a long time. To avoid watering the leaves, accumulation of moisture in the center of the foliage can cause decay. If you need to increase the air humidity, you can use spray and other methods.
In the spring of the seasons, some double-flowered varieties often have difficulty obtaining seeds, and only use cuttings or ramets to breed. Cuttings should be carried out at 5-6 and ramets in the fall.
How to plant primroses?
China's current planting of the more common primroses are the Ezhanchun, the Tibetan Primula and the Primula. These species are produced in low-altitude areas, like a cool, moist environment, not very cold, it is most suitable for greenhouse cultivation.