1 improper watering
If the symptom of yellowing leaves is that new tender leaves grow normally and old leaves wither and fall off, it is insufficient watering. If the leaves are dark yellow and dull, the new leaves will not shrink for a long time, and the old leaves will be watered too much when they are dry.
Solution:
Plan the watering amount reasonably and follow the principle of dry and thorough watering.
2 lighting factors
Some plants are shade-loving plants. If they are exposed to the sun for a long time, their leaves will turn yellow. Some plants like the sun. If they don't see the sun for a long time, their leaves will turn yellow.
Solution: Move this kind of plants to a suitable place, with shade-loving plants in the shade and sunshine-loving plants in the sun.
3 fertilizer factors
Excessive fertilization will cause the leaves to thicken and turn yellow, and the leaves of plants with insufficient fertilization will turn from green to light green and then gradually turn yellow from the roots.
Solution: Apply appropriate amount of fertilizer, not too much or too little.
4 environmental factors
Newly renovated houses may contain a lot of harmful gases such as formaldehyde, which will also cause the leaves of plants to turn yellow.
Solution: Strengthen ventilation and use activated carbon to absorb harmful gases such as formaldehyde.