The reason for the yellowing of hibiscus leaves, six reasons lead to leaf yellow shedding / with solutions

Hibiscus leaves are heart-shaped or oval-shaped, its lobes are triangular, and the leaves are usually emerald green, but some flower friends have encountered yellowing leaves in the process of planting, so what is the reason for the yellowing of hibiscus leaves? Let's learn more about it.

The reason for the yellowing of hibiscus leaves

1. Fertilization is too little.

When fertilizing too little, there is a lack of nitrogen, phosphorus, potassium and other elements in the soil, and these elements are necessary nutrients to ensure the normal growth of hibiscus. The lack of these elements will lead to thin leaves, thinner leaves and yellowing leaves. Therefore, reasonable fertilization is needed, and the method can be described in detail in how to fertilize hibiscus hibiscus.

2. Water yellow

Most cases of water yellow are caused by too much watering, and there is no timely drainage and waterlogging prevention in the rainy season, resulting in stagnant water in the soil. The roots are soaked in water for a long time, which will make the plant unable to absorb nutrients, and the leaves will turn yellowish. In this case, the drainage of the soil should be checked and attention should be paid to the control of watering times.

3. Dry yellow

Too much watering will lead to water yellowing, but if it is watered too little or even not watered for a long time, it will be dry and yellow. for example, only half of the water will be watered at a time, resulting in wet top and dry bottom, and the roots of the plant will not absorb enough water, thus causing hibiscus leaves to turn yellow. You should pay attention to replenishing water at this time, but remember to water too much at one time.

4. Soil consolidation

Botanists suggest that when planting hibiscus, we should choose loose sandy soil, but some flower friends do not notice this, so the air permeability and drainage of the selected soil are relatively poor, resulting in soil consolidation after planting for a period of time. Fertilizer and water can not infiltrate into the soil, resulting in lack of nutrition.

5. The light is too strong

Hibiscus likes light, but if it is exposed to the sun for too long in summer, it will also cause hibiscus leaves to turn yellow, the phenomenon is that the leaves are scorched, withered and then fall off. In this case, hibiscus should be moved to a ventilated and cool place for maintenance, and should be properly shaded if cultivated in the open field.

6. Diseases and insect pests

Leaf spot disease, leaf blight and so on will cause the leaves of plants to turn yellow, and in serious cases, there will be local necrosis, and the growth of the whole plant will be affected. When strange spots of various shapes are found on the leaves of Hibiscus hibiscus, it is necessary to check whether there are any diseases and insect pests. If there is, it should be timely prevention and control.

The reason for the yellowing of hibiscus leaves, what about the yellowing of hibiscus leaves?

Hibiscus flower language is beautiful, slim beauty, pure meaning, not only such hibiscus column-shaped elegant, gorgeous flowers, very good-looking, people can not help but look at the flowering plants, so hibiscus flowers are also favored by people. What about the reason why the leaves of Hibiscus hibiscus turn yellow? Next, I would like to introduce to you what to do if the leaves of hibiscus turn yellow.

The reason why the leaves of hibiscus flowers turn yellow. What about the leaves of hibiscus flowers that turn yellow?

The main results are as follows: (1) too much watering, the basin soil is too wet for a long time, resulting in lack of oxygen in the soil, causing part of the fibrous roots to rot, hindering normal respiration and absorption of water and nutrients, causing leaves to turn yellow and fall off. After the injury, the young leaves turn pale yellow, and then the old leaves gradually turn yellow. watering should be controlled immediately, fertilization should be suspended, and the soil should be often loosened to make the soil well ventilated.

(2) drought and dehydration. Flower cultivation leakage watering or long-term watering half waist water (that is, upper wet and lower dry) will affect nutrient absorption, and it is also easy to cause dull and dull leaves and drooping leaves. First, the lower old leaves aged, and gradually withered and yellowed off from the bottom up. At this time, a small amount of water is needed and sprayed, so that it can be gradually recovered and then transferred to normal watering.

(3) to lose weight for a long time. There is no application of ammonia fertilizer or no change of soil for a long time, and there is a lack of nitrogen and other nutrients in the soil, resulting in thin branches and leaves and thin and yellow leaves. It is necessary to pour the pot in time and gradually apply rarefied mature liquid fertilizer or compound flower fertilizer into new loose and fertile culture soil.

(4) excessive fertilization. If you fertilize too much, the new leaves will be thick and uneven, and the dry tips of the old leaves will fall off. You should immediately stop fertilization and increase the amount of water to make the fertilizer flow out from the drainage hole at the bottom of the basin, or immediately pour the pot, rinse the soil block with water and then plant it again into the basin.

(5) hot and high temperature. In summer, if you put cool flowers (such as cyclamen, Golden Bell upside down, four Seasons Begonia) in a high temperature place to let the strong light shine directly, it is very easy to cause the young leaf tip and leaf edge to scorch, or the leaf yellow to fall off. Move to a well-ventilated shady place in time.

(6) excessive shading. If the sun-loving flowers are kept in shade or lack of light for a long time, it will cause the branches and leaves to grow, the leaves are thin and yellow, and they do not blossom or rarely bloom. Be careful to move the flowerpot to the sunny place.

(7) soil and water is alkaline. There are more saline and alkali in soil and water in most areas of northern China, and flowers with acid-like soil are planted, such as rhododendron, camellia, Michelia, gardenia, orchid, magnolia, sweet-scented osmanthus and so on. Due to the lack of soluble iron and other elements that can be absorbed by the soil, the leaves will gradually turn yellow. Acid soil should be selected when planting, and alum fertilizer and water should be often watered during the growth period.

(8) whether it is airtight or not. If too much nitrogen fertilizer is applied, the branches and leaves will grow luxuriantly, coupled with the long-term unpruned, resulting in insufficient light in the inner chamber branches and leaves, which is easy to cause the leaves to yellowing and falling off. Reasonable fertilization should be applied and pruning should be strengthened to make it ventilated and transparent.

(9) dry air. When the indoor air is too dry, some flowers that like the humid environment, such as hanging orchids and orchids, often appear leaf tip dryness or leaf edge scorching and so on. Attention should be paid to water spraying, plastic film cover and other methods to increase air humidity.

(10) improper temperature. If the room temperature is too low in winter, the flowers are often vulnerable to cold damage, which leads to the yellowing of the leaves and death in severe cases. If the room temperature is too high, the transpiration of the plant is too high, and the root water and nutrients are in short supply, the leaves will turn yellow. Please pay attention to adjust the room temperature in time.

(11) the soil is sour. It is easy to lose acid and magnesium in southern red loam. planting flowers and trees with alkali-tolerant or mute soil, such as oleander, yellow poplar, Yingchun, etc., are often prone to green and yellowing between the veins of old leaves. Can apply calcium magnesium phosphate fertilizer or spray magnesium sulfate solution.

(12) pests and diseases. Leaf spot disease caused by fungi and other bacteria is easy to cause local necrosis of the leaves, yellow spots or patches appear, the whole leaves wither and fall off seriously, yellow and green mottle appears on the leaves after being infected by mosaic virus, and damaged by shell insects, red spiders and so on, the leaves will also become local yellow, or even the whole leaves will wither and fall off. All should be sprayed in time.

(13) strong sexual stimulation. The use of excessive concentration of pesticides in the prevention and control of diseases and insect pests, or being polluted by toxic gases in the atmosphere, or suddenly watering cold water when the temperature is high, are easy to cause local yellowing and scorching of the leaf tip or leaf surface, or even the whole plant to die. Therefore, we should pay attention to the rational use of pesticides and try to eliminate air pollution sources. Avoid watering flowers with cold water around noon in midsummer. Finally, it should be mentioned that the yellow leaves of potted flowers are sometimes caused by one reason, but they are often caused by a variety of factors, so a correct diagnosis should be made to prescribe the right medicine to the case.

How to raise hibiscus, the breeding methods and matters needing attention / fertilization should be reasonable.

As the efficacy and function of hibiscus are very many, among which the ornamental value is very high, so more and more people raise it, but some flower friends do not understand how to raise hibiscus, and sometimes the wrong methods lead to poor plant growth. Today, the editor will introduce the correct breeding methods and matters needing attention.

How to raise hibiscus?

In winter, the hibiscus planted by some flower friends often freeze to death on the ground, causing some flower friends to be very distressed, so how can hibiscus be raised to avoid this situation? We need to know its growth habits first.

Growth habits of Hibiscus hibiscus L.

Hibiscus likes sufficient light, shade tolerance is general; like warm and humid climate, cold tolerance is weak, the suitable temperature for growth is above 10 degrees; like fertile and loose sandy soil; grow fast and have strong resistance to harmful substances.

Culture methods and matters needing attention of Hibiscus hibiscus

1. Sandy soil

Hibiscus has general requirements for soil, but whether potted or planted in open field, it is best to use sandy soil with good drainage, such as garden soil rich in humus, river sand and so on.

Note: after selecting the soil, the soil should be disinfected by putting the soil in the sun or soaking the soil in a disinfectant solution. This method is recommended.

2. Porcelain flowerpot

How to raise potted hibiscus? The choice of container is very critical, generally with a relatively large porcelain flowerpot or plain burning pot is appropriate, before planting, you can pad a few tiles at the bottom of the basin to prevent the drainage hole is too large so that the water loss is too fast.

Note: the choice of the basin should not be too large to ensure that there is enough space for the growth of the plant, and the pot needs to be changed every 1-2 years, which is very important in the breeding methods and matters needing attention of hibiscus.

3. Watering frequently

Hibiscus grows very vigorously in spring and should be watered in time; while the temperature is hot in summer and should be watered a lot. After the temperature drops in autumn, watering should also be reduced, and in winter it should be watered less or not depending on the temperature change.

Note: no matter what season watering, to follow a principle, that is not dry do not water, watering must be thoroughly, but also need to prevent stagnant water in the basin.

4. Rational fertilization

Many flower friends raise hibiscus hibiscus in order to enjoy its beautiful flowers, and if you want to make the flowers bright and full, fertilization is the key link, so how to raise hibiscus hibiscus in fertilization? Phosphate fertilizer should be applied before flowering, organic fertilizer should be applied every 15 days in other seasons, and fertilization should be stopped in winter.

Note: fertilization is to promote hibiscus growth and provide adequate nutrients, but do not apply too much fertilizer, otherwise the leaves are thick and yellow and easy to fall off, and flowering will become difficult.

5. The light should be sufficient.

Hibiscus has a certain ability to tolerate shade, but it prefers an environment with plenty of light, especially before flowering, which ensures that the flowers are more beautiful, while when there is a lack of light, the buds are few and easy to fall.

Note: even if you enter the dormant period in winter, you should ensure a certain amount of light, which is often ignored in the breeding methods and precautions of hibiscus, and if the sun is too strong in summer, it can help hibiscus shade.

6. Good temperature control

Hibiscus likes a warm environment, it has a certain ability to withstand cold, but in a low temperature environment, its aboveground part may freeze to death. Although it will sprout new strips and blossom normally in spring, it will have a certain effect on its growth. therefore, the temperature should be kept at 10-25 degrees.

Note: when the temperature is low in winter, hibiscus should be insulated, which can be moved back to the room to avoid freezing damage caused by too low temperature.