What are the solutions for dry and yellowing leaves on a Radermachera sinica?

Radermachera sinica, formerly known as cai dou shu, because of its lush branches and leaves, and it symbolizes happiness, so it is regarded by people as a symbol of happiness, often placed in homes or offices, both are good choices. Growing Radermachera sinica is not such a simple problem, during the care process, the phenomenon of dry and yellowing leaves is common, let's look at the causes and solutions together.

1. Solutions for dry and yellowing leaves on Radermachera sinica

1. Metabolism

Radermachera sinica is constantly undergoing metabolism as it grows, so there will be the phenomenon of old leaves dying and turning yellow;

Handling method: this is a normal phenomenon, just cut off the yellow leaves directly, no special care is needed.

2. Sudden environmental change

Because of sudden environmental changes, temperature, humidity and light change too greatly, or repotting damaged the roots and it needs to recover, causing the leaves to turn yellow and dry;

Handling method: there is no need to worry in such cases, measures can be taken to reduce the degree of environmental change, and it will be fine once the Radermachera sinica adapts.

3. Dry air

Poor indoor ventilation leads to dryness, and the leaf tips will appear dry and yellow;

Handling method: increase indoor ventilation, and appropriately spray water to increase indoor humidity.

4. Improper watering

Too much watering blocks root respiration or even causes rot, affecting absorption and causing a large number of yellow leaves;

Handling method: pay attention to watering, look at the surface soil, do not wait until the soil is completely dry before watering. When watering, water thoroughly, and do not keep the frequency fixed for a long time.

5. Too much fertilizer

Check whether the amount of fertilizer is too large, whether the organic fertilizer used is fully decomposed, and so on;

Handling method: at this time, you can flush the potting soil with water to dilute the fertilizer strength, but be careful not to cause water accumulation.

6. Insufficient light

It may be caused by the plant being in too dark an environment with insufficient light;

Handling method: give the Radermachera sinica plenty of sunlight, but avoid exposure to strong sun.

2. Notes on growing Radermachera sinica

1. Light aspects

Light is very important. Radermachera sinica likes to grow in a semi-shaded environment, and full light is also acceptable. When it sprouts in spring, it only needs appropriate watering, which can inhibit the Radermachera sinica from growing too tall. In hot seasons, it needs to be sprayed with water 2-3 times a day to prevent heat stress, and strengthening water spraying for the plant will create coolness and moisture.

2. Temperature aspects

The growing environment of Radermachera sinica is also very important, mainly the temperature. The daytime growth temperature is 20°C-21°C, and at night it is 18°C-19°C. In the hot midsummer, the temperature should be kept below 27°C as much as possible. When the environmental temperature is very high, shade should be provided appropriately with a shed. Increase environmental humidity, thereby increasing the humidity on the leaf surface. In winter, the temperature must not be lower than 8°C, and the humidity must not be less than 5°C, otherwise it will be frostbitten.

3. Soil aspects

When growing Radermachera sinica, the soil is also particularly important. It is best to choose a loose, breathable, well-drained and nutritious soil. Usually it is prepared with garden soil: leaf mold: decomposed organic fertilizer: river sand = 5:3:1:1. During the growing season, loosen the soil once a month to ensure that the root area is always in a well-ventilated state. If water accumulation is found in the pot, it should be drained as soon as possible, and after the potting soil dries out, repot and change the soil.

4. Watering aspects

Radermachera sinica likes moisture. During the seedling stage, the seedbed must be kept moist. In hot and dry seasons, more attention should be paid to water supply. But water accumulation must not occur, to prevent waterlogged root rot in Radermachera sinica. When new shoots emerge in spring, watering should be appropriately controlled, and it is only necessary to keep the potting soil relatively moist, so as to avoid it growing too tall. In winter, do not water too much, otherwise it may cause water accumulation and root rot. Radermachera sinica likes moisture and fears dryness. During the seedling stage, keep the seedbed moist. In hot and dry seasons, more attention should be paid to water supply. To prevent leggy growth, watering can be controlled when shoots emerge in spring, keeping the potting soil moist. In summer and autumn, spray regularly, and do not water too much, so as to avoid water accumulation and root rot.

5. Fertilization aspects

During the growing season, apply a quick-acting liquid fertilizer once a month. After the Mid-Autumn Festival, 2 to 3 consecutive applications of 0.3% potassium dihydrogen phosphate solution can be given to increase the cold resistance of the Radermachera sinica plant, which is relatively helpful for it to overwinter safely. When the summer temperature is above 32°C, and after the temperature drops below 12°C in late autumn and early winter, topdressing should be stopped. For potted plants, repot in April each year, add an appropriate amount of decomposed cake fertilizer or 3% multi-element compound fertilizer to the culture soil as a base fertilizer, and apply cake fertilizer water once a month during the growing season or bury multi-element slow-release compound fertilizer. At the Mid-Autumn Festival, 2 to 3 consecutive applications of 0.3% potassium dihydrogen phosphate can be given to increase cold resistance. When the summer temperature is above 32°C, or below 12°C in winter, stop topdressing.