The efficacy and function of Four Seasons Grass Tablets

Primrose is a perennial woody plant. The stem is short, about 30 cm high, and dark brown. Many roots. The leaves are basal, oblong to elliptical, with long petioles and shallow notches on the edges; the leaves are smooth, with dense milky white soft hairs on the back, and often carry irritating and harmful secretions. The flower stalk emerges from the leaves, the umbel is large, the calyx is funnel-shaped, and Corolla is bright red. There are a full range of cultivated varieties with bright colors, including white, magenta, purple-red, blue, light red or light purple. The seeds are tiny and dark brown when mature. It likes sunshine, but is afraid of strong light; it is afraid of heat; it likes acidic, alkaline, and rich humus soil.

The natural environment of the growth of four-season primrose

It grows and develops in the basalt area of ​​mountain slopes at an altitude of 1000-200b250. It likes cold and humid weather and avoids extreme heat and exposure. The seedlings are not resistant to heat, fertilizer, but not to low temperatures. The preferred temperature for growth and development is 13-18℃. The best soil is sandy loam with a high lime content, good drainage and good indoor ventilation.

Depending on the temperature, it can grow and develop within 110 to 140 days.

The blooming temperature of four-season primrose is 10-15℃. It does not require low temperature like other primroses, but moderate low temperature can make the main stem grow strong and compact, and also increase the number of branches. After entering the flowering period, the concentration of phosphorus and potassium fertilizers should be appropriately increased. Generally, 200ppm of 15-10-30 fertilizer is used. After the flowering period, pay attention to pruning the fallen branches to avoid the occurrence of gray mold.

Four-season primrose breeding method

Primrose is generally propagated by planting. If you want it to bloom in summer, you need to plant it in February or March. If you want it to bloom in spring, you need to sow it in July or August. The seeds are tiny and have a short cycle, so they should be sown immediately after harvesting. The soil for planting generally consists of 5 parts humus, 3 parts compost, and 1 part sand. No soil is filled in, and the top of the pot is covered with a glass lens to keep it moist and hydrated. The temperature is maintained at 15-20°C, the soil is moist, and the seeds will germinate in one or two weeks. After germination, they can be gradually planted in areas with sufficient sunlight. [1]

When the seedlings have 2-3 leaves, they can be transplanted into 10 cm pots when they have 5-6 leaves. When planting, avoid burying the root neck in the soil. Bonsai soil is usually a mixture of humus soil, culture soil, and rice husk ash, with an appropriate amount of fertilizer added. For early-sown seedlings planted in mid-to-late June, pay attention to shade when growing them in the open field. There is no shade in winter, but a small amount of shade is available in spring and autumn. Fertilize once every half a month or so during the growing period. The indoor temperature is maintained at around 12℃ in winter, and it will enter the flowering period around the Spring Festival. After the flowers fade, cut off the flowers and plants and remove the dead branches. With proper management, the flowers can bloom again for several months. Artificial pollination assistance during the flowering period can increase the fruit set rate. The fruits mature at different times and should be harvested as they mature. The main stem after flowering and seed collection is generally no longer preserved. For preservation, open-field cultivation and management methods are troublesome and not as convenient as biennial cultivation.

Common diseases of primrose are gray mold. In the early stage of the disease, the main symptom is the appearance of water-like black spots on the leaves and tender stems, which slowly expand until they rot. The disease develops faster when the relative humidity of the air is high. The prevention method is to first improve its ventilation conditions and promptly remove diseased leaves and plants. In the early stage of the disease, you can also use a 1:1:150:200 Bordeaux mixture sprayer, or you can mix 1:50 triadimefon and grass ash and spread it on the soil surface, which can achieve good prevention effect.