What is the reason why the new leaves of orchids grow yellow when old leaves grow?

Because the nutrients in the soil are insufficient, it is no longer enough to maintain the nutrient replenishment of the newly grown leaves. The correct way to do this is to use a compound fertilizer or organic powder to put it in the soil.

It is very likely that there is not enough water, there is no regular and quantitative watering, so the old leaves are easy to turn yellow, and it may also be that the soil environment is not good, and the soil environment needs to be improved.

1.The planting material is fine and not breathable. The planting material ratio of cultivated orchids is too fine and stuffy, which can easily cause yellowing of orchid leaves.

2.Excessive sun exposure is dry and yellow. The light intensity is not well controlled in the usual maintenance, resulting in the dry yellow of the orchid leaves, and the leaves appear oldOrchid basin is dry and lacks water. Due to the uneven dryness and humidity, the orchid leaves are yellowish, the color is uniform but lacks luster, and the orchid leaves are weak and weak in severe cases, and there are signs of dehydration.

Causes of yellowing and solutions:

1. Water yellow. Caused by over-frequent watering, it is characterized by no obvious change in old leaves and yellowing of young leaves; Water should be controlled immediately.

Second, dry yellow. Due to the lack of water, caused by drought, it is characterized by the bottom up of the old leaves first yellow, if the lack of water for a little longer, the whole plant yellow leaves, or even death, should be watered when the rough blue. 3. Fat yellow.

Caused by excessive application of slippery pants fertilizer or too high concentration, the special rock lifting point is that the young leaves are hypertrophied, shiny, and uneven; Fertilizer, cultivation and watering should be controlled.

Fourth, hungry yellow. Due to the lack of fertilizer, low fertilization concentration, and the fertilization interval is too long, it is characterized by the first yellow at the young leaves and young stems, if this phenomenon is not fertilized in time, it will also cause the whole plant yellow leaves and even die; For flowers lacking fertilizer, avoid applying a large amount of thick fertilizer at one time, so as not to cause root burning.

When too much stagnant water is deposited at the bottom of an orchid pot, it can affect the entry of oxygen. In the hypoxic state, the root system of the orchid cannot absorb nutrients normally, resulting in the yellowing and drying of the leaves. When the situation is not too severe, you can use the method of raising the pot or loosening the soil to promote the evaporation of water.

In more severe cases, the orchids need to be removed from the pots, the soaked roots should be cut off, and transplanted into new soil.

Orchids have strict requirements for light, lack of light will make the plant grow poorly, and strong light is easy to burn the leaves, causing the leaves to turn yellow and fall off.

The yellowing of orchid leaves can be caused by too much sunlight or too low a temperature.

At this time, you should first use scissors to cut off the yellowed leaves on the plant, and then move it to a place where there is no bright light.

At this point, move it to a place where the temperature is between 18 and 25 and wait for it to recover. It can also be caused by a lack of moisture.

At this time, it is necessary to water once to water the flower soil completely, and then increase the frequency of watering appropriately to replenish its moisture.

First, the light is too strong.

1. Reason: Except for a few varieties such as orchids, most orchids do not like strong light. If they are raised in a place with high light intensity, their leaves will be sunburned and turn yellow by strong light.

2. Treatment method: At this time, the leaves that are completely yellowed on the plant should be cut off with scissors. Then, move it to a well-ventilated area without bright light, or use a blackout net to shade it. After waiting for a while, it can be restored.

Second, the temperature is too low.

1. Reason: Orchids like warmth and are not particularly cold-tolerant. If the plant is kept in a particularly cold place for a long time, it will cause it to grow poorly and its leaves will turn yellow.

2. Treatment: first move the orchid to a place where the temperature is between 18 and 25, and then appropriately increase the time it receives light, and wait for it to recover.

3. Lack of moisture.

1. Reason: If you do not water the orchid for a long time when you care for it, it will also cause its leaves to turn yellow.

2. Treatment method: At this time, it should be watered in time. Water thoroughly once first, and water the soil thoroughly, but don't let the soil become waterlogged. Then increase the frequency of watering to replenish it.