Analysis of the causes of yellowing and dropping leaves in the Radermachera sinica (China Doll)

During the care of the Radermachera sinica (China Doll), yellowing and dropping leaves often occur, and in severe cases it can lead to death, greatly reducing its ornamental value. The main causes are:

1. Too much water

The Radermachera sinica likes moisture but hates waterlogged conditions. In hot seasons evaporation is high, so it has relatively high water requirements. If the soil is clayey or the drainage holes are blocked, the soil stays overly wet for a long time after watering, the roots are prone to suffocation, their absorption capacity weakens, and insufficient nutrient supply leads to leaf yellowing.

2. Temperature too low

The suitable growth temperature for the Radermachera sinica is 20 to 30°C. It tolerates high temperatures but grows poorly at low temperatures, and in winter it is best kept above 10°C. If it stays below 5°C for a long time, cold damage occurs, causing leaves to yellow and drop. In winter it should be placed in a sunny spot or a warm greenhouse to prevent cold damage from affecting the plant's normal growth.

3. Insufficient light

Potted Radermachera sinica is mostly grown indoors as a foliage plant, but it likes light. If it is kept for a long time in a dim indoor spot, photosynthesis is weak, the nutrients synthesized are reduced, and the leaves easily yellow and drop. The Radermachera sinica can be placed in a spot with ample scattered light, and in winter it can receive full sun. If the indoor spot is rather shady, it can be taken outside periodically to restore its vigor.

4. Poor ventilation

If the Radermachera sinica is kept for a long time in a poorly ventilated place, combined with overly dense branches and leaves, yellowing and dropping leaves also easily occur. It can be pruned periodically, thinning out overly dense branches to improve ventilation.

5. Pests

When spider mites and scale insects occur in large numbers, they can also cause leaves to wither, yellow and drop. For spider mites, dicofol at 1000 times dilution can be used for control; for scale insects, profenofos at 1000 times dilution can be used for control, sprayed 3 to 5 times in a row, once a week.

Causes of yellowing and dropping leaves in the Radermachera sinica and points to note

Flower and Bonsai Network introduction: What the Flower and Bonsai Network editor brings you today is an article about the causes of yellowing and dropping leaves in the Radermachera sinica and points to note. Let's take a look.

Flower enthusiast: The Radermachera sinica's leaves are dropping and drying out, what's going on? Watering thoroughly every four or five days

Plant care consultant Old Chen: Leaf drop in the Radermachera sinica is a very typical problem, so Old Chen will answer it. This flower enthusiast's Radermachera sinica is clearly suffering from yellowing and dropping leaves caused by overwatering and root waterlogging.

Why can I be sure that her Radermachera sinica has a problem because of overwatering? It's not that I'm especially professional or know the Radermachera sinica especially well, but rather that this flower enthusiast described the problem particularly clearly, and the photos were taken from every angle.

The more information I get from the flower enthusiast's description and photos, the easier it is for me to make the correct judgment!

Look here, from these photos of the Radermachera sinica, we can quickly tell that mainly the lower old leaves are dropping, secondly the upper leaves show large areas of dry tips, and the potting soil is very wet.

In addition, the flower enthusiast said it is watered once every four or five days, and the Radermachera sinica still looks quite dry.

In this kind of season, watering once every four or five days, and with the Radermachera sinica kept indoors, it would be a wonder if the roots didn't get waterlogged. Waterlogged roots lead to a lack of oxygen in the roots, making normal absorption of water and minerals impossible, so the Radermachera sinica shows signs of dehydration, which manifests as lower leaves dropping and upper leaves with dry tips.

So what to do now? Immediately place it in a well-ventilated spot, such as an open balcony, and then reduce the watering frequency. If the roots have not yet rotted from too much water, normal growth can be restored in about half a month.

What to do about yellowing leaves in the Radermachera sinica? Causes of yellowing leaves in the Radermachera sinica and solutions

The scientific name of the Radermachera sinica is Radermachera sinica, with aliases including chili tree, bone-setting parasol, mountain bean tree, and qilin trumpet creeper (a commercial name). It is native to Taiwan, China, Guangdong, Hainan, Guangxi, Guizhou, Yunnan and other places, mostly distributed in valleys and open flat forests at altitudes of 300 m to 850 m (Guangxi, Hainan) and 1100 m to 1700 m (south of central Yunnan). It is also distributed in India, the Philippines, Bhutan and other countries. It likes a high-temperature, humid environment with plenty of sunlight. It tolerates high temperatures, fears cold, prefers moisture, and hates dryness. For cultivation, loose, fertile, well-drained loam and sandy loam rich in organic matter should be used.

What are the causes of yellowing leaves in the Radermachera sinica?

1. The Radermachera sinica may have no roots, possibly freshly sawed off and placed in a pot (flowers bought from mobile vendors are prone to this situation).

2. Because of a sudden environmental change, the temperature, humidity and light differ greatly from the care environment in the greenhouse, or repotting damaged the roots and it needs to recover, thus causing leaf yellowing.

3. Heavy leaf drop in the Radermachera sinica may be related to watering, because if the plant's soil is too dry, the root system will be damaged to some extent. At this point, pouring in a large amount of water suffocates the already damaged roots, obstructs respiration, further damages the root system, affects absorption, and causes heavy leaf drop.

4. Caused by poor ventilation and air permeability, with leaf tips turning withered and yellow; caused by dry indoor air.

5. Possibly caused by the plant being in too dark an environment with insufficient light.

6. Whether the amount of fertilizer applied is too large, whether the organic fertilizer used is fully decomposed, and so on.

How should yellowing leaves in the Radermachera sinica be solved?

1. Do not wait until the soil is completely dry before watering, do not substitute spraying water for watering, do not water in fixed amounts, do not water continuously over a short period, and do not keep the watering frequency fixed for a long time.

2. You can spray clean water on its leaves 2 to 3 times a day, which can effectively prevent the leaf tips of newly emerging leaves from withering and yellowing. As for watering, water thoroughly at one time. Do not think it is thoroughly watered just because the surface soil looks wet; be sure to water around the pot until water comes out of the drainage holes. In the hottest part of summer, watering once every three or four days is enough; do not water too frequently. If you water too little, the leaves will wilt, but they will not turn yellow. Turn the pot often, and let the lower leaves receive sunlight too. If you feel it lacks fertilizer, apply some sauce residue or soybean cake fertilizer; these fertilizers last a long time and are mild, and will not harm the roots. Also, do not let the Radermachera sinica be exposed to cold wind. Now that the rainy season has arrived, move it farther away when the weather changes.

3. Turn the pot for all-around sunlight exposure, keep the air humidity moist, and promote coordinated, good growth.

What are the causes of leaf drop in the Radermachera sinica? How should it be solved?

1. Water-related causes

The most common cause in daily life is the amount of watering. We know the Radermachera sinica is a plant that rather likes water, but both too much and too little can cause leaf drop. If you are rather lazy and always only remember to water after a week, at that point the soil is too dry and the roots are fragile; if you suddenly pour in too much water, the roots will be damaged and leaf growth will be hindered, causing drop. But normally do not water too much either, to avoid root rot.

2. Light-related causes

All plants need light to ensure growth. If you keep the Radermachera sinica in a dark place for a long time, it will become unhappy. Especially in winter, take it out to bask in the sun often. Of course, in the hot summer it should not always be in the sun, to prevent the leaves from being scorched.

3. Temperature-related causes

The Radermachera sinica likes a warm, heated environment, with a suitable growth temperature of 20°C to 30°C. In the hot summer everyone needs to pay attention to moisture retention, provide appropriate shade, and increase humidity in the environment and by spraying water on the leaves. In the north, everyone should pay attention to temperature and keep the Radermachera sinica in a room with a suitable temperature.

4. Fertilizer-related causes

For potted Radermachera sinica, in addition to requiring an appropriate amount of decomposed cake fertilizer and 3% multi-element compound fertilizer in the growing medium, topdressing should also be given continuously. During the growing season, a quick-acting liquid fertilizer can be applied once a month, usually decomposed cake fertilizer water. For a small number of household potted plants, or for large potted specimens displayed for long periods in public places, a small amount of multi-element slow-release compound fertilizer granules can be buried periodically, or a mixed solution of 0.2% urea plus 0.1% monopotassium phosphate can be used for watering.

Through the detailed introduction in this article, we hope everyone can gain something from it! Thank you all for your support of and attention to Succulent Garden!