What causes cactus to turn yellow?

reason

Overwatering

The potting soil has been in an overly wet state for a long time, with extreme lack of oxygen, and the cactus gradually rots, which hinders the normal absorption of nutrients and water. As a result, the leaves turn yellow and fall off. At this time, you should stop watering and suspend applying fertilizer to keep the soil ventilated.

Drought and dehydration

It is just the opposite of the above. This is because the watering of flowers is wet on the top and dry on the bottom, which affects the absorption of water by the cactus, causing the leaves to become dark yellow and dull, and gradually turn yellow and fall off from the bottom to the top. At this time, stop watering or spraying, and maintain a suitable temperature to allow it to recover gradually.

Long-term weight loss

If the soil has not been changed for a long time, you should turn the pot over in time and gradually add compound flower fertilizer.

Overfertilization

Due to excessive fertilization, the old leaves gradually fall off. At this time, you should stop fertilizing, add an appropriate amount of water, immediately turn the pot over, and rinse the soil with water.

High temperature and heat

The cactus needs to be moved to a cool and ventilated place in time.

Over-shading

Due to insufficient sunlight absorption caused by long-term placement in the shade, it needs to be moved to a ventilated sunny place in time.

Alkaline soil and water

In the northern regions where the soil and water are alkaline, there is a lack of soluble iron, so the needles will gradually turn yellow. Apply alum fertilizer water in time.

Airtight

Appropriate pruning should be carried out to allow light to pass through. Due to the lush branches and leaves, it is easy for leaves to fall off, so pay attention to ventilation and light transmission.

Air Drying

If the air is too dry, you should spray water to increase the air humidity appropriately.

Improper temperature

As the seasons change, the room temperature will also change accordingly. Pay attention to adjust the room temperature in time.

Soil acidic

The loss of chemical elements in the soil causes the soil to become acidic, and alkaline solutions such as calcium, magnesium and phosphorus need to be applied.

Pests and diseases

Since leaf spot disease can easily be caused by pathogens, which causes branches and leaves to turn yellow, spray pesticides in time for prevention and control.

Strong sexual stimulation

Excessive concentration of pesticide spraying will cause pollution from toxic gases and lead to overall death. Pesticides should be used reasonably to prevent air pollution, make correct judgments and prescribe the right medicine.

Well, thanks to the editor’s efforts, this article is finally completed. I wonder if flower lovers have a deep understanding of it. Let us try to grow cactus together!