How to make gardenia flowers green

Scorpion hi warm and moist, like the sun and fear the sun exposure, but also tolerant to yin, not very cold, the growth of temperature 18 ~ 22 °C, the winter temperature above 5 °C, can withstand -5 °C low temperature. The biggest problem with gardenia conservation in the north is the yellow leaf. There was also a lot of money at the time of purchase, and it took a year to see no flowers.

This is because gardenia is very sensitive to soil pH, and the most suitable pH is 4.5-6. When the pH is higher than 6.5, iron-deficient yellow leaves will appear because the soil and water in the north are alkaline. At the time of purchase, the pH of potting soil is more appropriate. Due to continuous watering, the soil is gradually alkalized. The main cause of iron deficiency is the first yellow on the new leaf, the veins on the new leaf, or the green color. When it is severe, it turns yellow-white, and the tips and edges of the leaf are scorching. High-temperature, high-humidity, and strong light without ventilation will also cause yellowing of the lower leaves.

In addition, there is frost damage in winter or the soil temperature in the growing season is below 18°C, which will also cause functional iron deficiency. Therefore, gardenia must be cultivated with well-drained, loose, and fertile sandy loam with a pH of 5 to 6; in the south, it should be cultivated with mountain soil or paddy field soil; in the north, it should be cultured with soil; generally, 4 parts of rot-foliar soil (peat) should be used. One serving of sand, one heap of manure, plus 1 to 3 kilograms of sulfur and ferrous sulfate (or aluminum sulfate) per 100 square meters. Water must be used for watering, yellow leaf disease is the best combination of organic fertilizer and ferrous sulfate.

The addition of ferrous sulphate to farmer's grass tortoises produces good control of yellow leaves. Summer should be placed in a ventilated, high humidity, dark shelter, to prevent the lower yellow leaves. There are pots of water, winter roots are frozen, the concentration of fertilizer is too large to burn roots, will cause yellow leaves, to attract attention, timely correction.

Hibiscus flowers can be applied fertilizer, can be applied to livestock manure water or cake fertilizer, during the growth period, apply fertilizer every 10 to 15 days of water, in the early spring buds add nitrogen and phosphorus fertilizer, after the application of fertilizer, generally used compound fat. The gardenia flower is so damp that it is scarce. In the spring and autumn, water is used once every 2 to 3 days, once in the summer, and once every 5 to 7 days in the winter. Watering must use 10 to 20 times of manure water.

Spray water to the leaves in the morning and evening of summer to make the leaves shine green. After the spring, cut off the weak branches and long branches on the trunk, remove the flowers after flowering, when the branches grow to 10 to 20 centimeters, leave 2-3 pairs of leaves topping, and adjust the orientation of the branches to make them dense and appropriate. appropriate. Gardenia germination power is strong, such as the crown is too high or too dense, can be appropriately sparsely cut, can be retracted after flowering, in August on the two lychee topping, but can not be strong in winter retraction.

The common diseases of gardenia are anthracnose and leaf spot. In the early stage of disease, 75% chlorothalonil 600 times or 50% carbendazim can be used for 800 times, every 7 to 10 days, and even sprayed 2 or 3 times. , Leafhoppers, Coffee Pekinoptera can be treated with 10% cypermethrin 3000 times.

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