Way of making green leaves of gardenia
The scorpion is warm and humid, like the sun and faintly exposed to the sun, can also withstand the shade, not very cold, the growth temperature is 18~22 °C, the winter temperature is above 5 °C, and it can withstand the low temperature of -5 °C. The biggest problem with gardenia in the north is the yellow leaf, and it was spent a lot at the time of purchase.
This is because gardenia is very sensitive to soil pH. The most suitable pH is 4.5~6. When the pH is higher than 6.5, there will be iron-deficient yellow leaves, because the soil and water in the north are alkaline. The pH of the potting soil is more suitable. Due to continuous watering, the soil is gradually alkalized. The iron deficiency mainly shows that the new leaves are yellow first, the veins are still green, and when it is severe, it turns yellowish white, and the tip and edge of the leaves are scorched. High temperature, high humidity and strong light without ventilation will also cause yellowing of the lower leaves.
There is also winter frost damage or soil temperature below 18 ° C in the growing season, which will also cause functional iron deficiency. Therefore, cultivated gardenia must use well-drained, loose, fertile sandy loam at pH 5~6, cultivated with mountain soil or paddy soil in the south, and cultivated soil in the north, generally 4 parts of humus soil (peat), garden soil 4 1 part, 1 part of sand, 1 part of compost, add 1~3 kg of sulfur, ferrous sulfate (or aluminum sulfate) per 100 square meters. Watering must use hydrazine water, and it is best to control the yellow leaf disease by mixing organic fertilizer with ferrous sulfate.
Huanong uses lycopene to add ferrous sulfate, which has a good effect on the control of yellow leaf disease. In the summer, it should be placed in a ventilated, humid, dark shelter to prevent the lower yellow leaves. There is also water in the basin. In winter, the root system is frozen. If the concentration of chemical fertilizer is too large, it will cause yellow leaves. It should be noticed and corrected in time.
Gardenia flower is fertilized, can be applied with animal manure water or cake fertilizer water. In the growing season, apply fertilizer water every 10~15 days, apply nitrogen and phosphorus fertilizer in early spring bud stage, apply fertilizer after flowering, generally use compound fat. Gardenia flowers are like to be wet, and every 2~3 days in spring and autumn, once a day in summer and 5~7 days in winter. Watering must use 10 to 20 times more water.
Spray water on the leaves in the morning and evening in the summer to make the leaves green and bright. After the spring, cut off the small weak branches and long branches on the trunk. After the flowers are dropped, remove the residual flowers. When the branches grow to 10~20 cm, leave 2~3 pairs of leaves to pick the heart, and adjust the orientation of the branches to make it dense and moderate. appropriate. Gardenia germination is strong. If the crown is too high or too dense, it can be properly thinned. It can be retracted after flowering. In August, the two lychees are topped, but they cannot be retracted in winter.
The common diseases of gardenia are anthracnose and leaf spot disease. In the early stage of the disease, 75% chlorothalonil 600 times or 50% carbendazim 800 times can be used, every 7~10 days, even spray 2~3 times. , leafhopper, coffee hawk moth can be controlled with 10% cypermethrin 3000 times.
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