In the past, the purple-backed sunflower was a kind of wild vegetable grown on the edge of the vegetable garden. Without human management, it could grow into a large piece. Nowadays, there are artificial plantings. In the southern regions, especially in warm and humid places such as Sichuan and Guangdong, there are more species. The young shoots and leaves can be eaten. They can be fried, or they can be served with cold salad. In fact, the purple-backed sunflower is relatively easy to plant, the pests and diseases are relatively small, basically do not need to spray any pesticides, the following small series to talk about the cultivation technology of purple-backed sunflower.
1. Appropriate environmental conditions
Purple-backed sunflower is a kind of warm and humid vegetable. The suitable growth temperature is 20-25 °C. It can still grow well under high temperature in summer, but it is not resistant to low temperature. It is dead in frost and can withstand low temperature of 3-5 °C. The area south of the Yangtze River can grow on an annual basis. We must move it indoors in the north of the Yangtze River in winter; it is not high in light and more resistant to yin, but it grows better when there is sufficient light; the soil is not strict, and various soil types can be said. It grows well, but grows better under conditions of sufficient nutrients.
2, planting methods
The purple-backed sunflower can be propagated with seeds or cut and propagated. This kind of dish is still relatively rare here. The first time we plant it, we can cut it later.
In the case of greenhouse seedlings, it will be planted in February and March, and the live broadcast will be planted in about the beginning of April, when the ground temperature is stable above 12 °C. Water is sown before sowing, dry seeds are broadcast live, cover soil about 1cm after sowing, keep the soil moist before emergence, and emerge about 8-10 days under suitable conditions. When the seedling grows 15cm, it can be planted or transplanted.
The cuttings are generally carried out in the spring of 2-3 months or in the autumn of August to September. The 6-8 cm twigs are cut from the disease-free plants, and the cut branches are inserted obliquely into the seedbed, the depth is about 1/3, and the heat preservation is moist. Rooting and germination took about 15 days at 20-25 °C.
About 4,000 plants are planted in an acre of purple-backed sunflower, and the young shoots can be harvested once in the vigorous growth period of 7-10 days. The southern region can be supplied for the anniversary, so the growth of the purple-backed sunflower is very large, and the yield is high. Good quality, soft branches must be applied more fertilizer. Apply 3 tons of decomposed manure per acre before planting or planting. After each harvest, apply 30 kg of nitrogen fertilizer per acre. The whole seasoning should be evenly watered. See dry and wet, small water and water to keep the soil moist. The state, don't overdo it and flood the water.
The above is the planting technique of the purple-backed sunflower, and the purple-backed sunflower is very beneficial to the body. It has the effects of clearing heat, moistening the lungs, relieving cough and removing phlegm. If you feel that the taste of the purple-backed sunflower is too heavy, you can put it in boiling water and remove it.
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