There were four trees in it when I bought it. I bought it for four months and now I have grown a lot, but the leaves have turned yellow recently.

During the growth of potted flowers, sometimes the leaves turn yellow. There are many factors that cause the leaves to turn yellow, and some are one.

There are various reasons.

First, the water is yellow. The yellowing of leaves caused by long-term watering shows that the young leaves are yellow and dull, the old leaves have no obvious change, and the roots are thin.

Small yellow-green, the new buds don't shrink, so it is necessary to control the water. If it is serious, you can take off the pot and dry the soil in the shade and then put it on the pot.

Second, drought and yellow. The leaves turn yellow because of lack of water or water. Old leaves wither and fall off from bottom to top, but new leaves are usually born.

Grow normally. The amount and frequency of watering should be appropriately increased.

Third, fat yellow. Because of too much fertilization or too high concentration, the new leaf tip appears dry brown, and the old leaf tip is brown yellow, which is common.

Although the surface is thick and shiny, it is mostly uneven. Should stop pouring fertilizer or rinse fertilizer with clear water.

Fourth, the lack of fat yellow. Potted flowers are only watered for a long time without fertilization, or the pots are not changed for many years, and the roots must form a ball, so that the plants can not get fertilizer, which makes

When the leaves turn yellow, in addition to changing pots in time, we should also apply thin fertilizer frequently.

Fifth, burn yellow. I like wet potted flowers and foliage plants, such as chlorophytum, evergreen, Eupatorium odoratum, Hosta, etc. Exposed to strong sunlight.

In direct light, the blade tip often appears yellow and should be placed in a cool place.

Sixth, alkali yellow. Flowers that like acidic soil, such as Rhododendron Camellia, Osmanthus fragrans and Magnolia grandiflora, often cause defoliation if the soil or water quality is alkaline.

From green to yellow, or even fall off, in addition to cultivating with acidic nutrient soil, alum is rich in water or 0. 2%-0。 5% ferrous sulfate

Spraying aqueous solution can not only make the leaves turn from yellow to green.

Seven, damp and hot yellow. Some flowers that are not resistant to high temperature and high humidity turn yellow due to hot summer, poor ventilation and improper shading.

If the golden bell jar is upside down, the cuckoo has this phenomenon in a hot and humid environment. Attention should be paid to ventilation and cooling, and the pot soil should not be overheated.

Eight, albino yellow. Due to insufficient light in flowers, chlorophyll in leaves decreases, which makes the green of leaves gradually disappear, showing albinism.

If you are sick, you can move the plants to a sunny place and let the leaves turn green slowly.

Nine, low temperature yellow. In cold winter, if the indoor temperature is low, some flowers that are afraid of cold, such as white orchid, Guangdong evergreen, poinsettia, etc.

Leaves will turn yellow and fall off. In addition, flowers harmed by pests and diseases will also cause yellow leaves to fall off. Such as the lower part of a plant.

It is normal for some leaves to turn yellow and fall off.

Diagnosis and control measures of yellow leaves of potted flowers

During the growing period of potted plants, the leaves often turn yellow. The reason is mostly due to improper cultivation management. Here are some "yellowing" phenomena.

1. Long-term soil waterlogging in the Yellow River Basin leads to soil hypoxia, which weakens the ability of some roots to rot and absorb water and fertilizer. It is characterized by dark yellow leaves, atrophy of the top of new shoots and small yellow-green branches. In this case, we should loosen the soil, control watering and stop fertilizing. In severe cases, we can take off the pot and put it in the shade to dry the soil balls and put them in the pot.

2. The yellow leaves caused by excessive fertilization or high concentration, especially the biased application of nitrogen fertilizer, show that the new leaves are thick and shiny, but the leaves are uneven and the old leaves gradually turn yellow and fall off. At this time, fertilization should be stopped, the amount of watering should be increased appropriately, and nutrients should be diluted. Potted flowers are short of fertilizer and water, or a big pot is small, and the roots in the pot are aging or too dense, which will also make the leaves of flowers and plants thin and yellow. At this time, it is necessary to change pots and soil, usually from rainy to long summer.

3. Alkaline yellow potted flowers, such as camellia, Milan, Michelia, Rhododendron and Jasmine. Due to the alkaline reaction of soil, they often lose their green and yellow colors. It is manifested in the veins starting from the new leaves at the branches, while the veins, especially the main veins, remain green and the yellow-green phenomenon is very obvious. With the aggravation of yellowing, the veins gradually turn green, then the whole leaves turn white, the leaves are scorched, the leaves wither, and in severe cases, the branches wither and the whole plant dies. For this "yellowing" phenomenon, acid fertilizers or acidic substances can be used to improve it, and alum fertilizer can also be used frequently.

4. Flowers as dark as sunlight often turn yellow due to insufficient indoor light. At this point, pots and pans should be moved to outdoor ventilation and lighting. For semi-negative flowers, such as asparagus, leaves will turn yellow under strong light, so to avoid exposure to high temperature and strong light in summer, they should be moved indoors or stored in a light-proof shed.

5, drought and yellowing Due to long-term non-watering, or less watering, the leaves turn yellow or brown ends and brown edges appear, and the old leaves fall off from bottom to top. However, new leaves generally grow normally, so when this happens, water should be added to make the soil no longer short of water.

6. Burning yellow likes wet potted flowers, such as chlorophytum, evergreen, Hosta, etc. If exposed to strong direct sunlight, leaves also have brown ends and brown edges. If this happens, put the jar in the shade.

7, hot and humid yellowing Some potted flowers that are not resistant to high temperature and high humidity, the leaves are yellow due to poor ventilation and improper shading in midsummer, such as hanging bell begonia, this phenomenon occurs in summer. Therefore, high temperature and high humidity can easily lead to yellowing of leaves, which can be prevented by paying attention to ventilation and cooling, and the soil in the basin should not be too wet.