When many flower lovers are growing flowers, usually encounter the problem of flower leaves turning yellow. So what causes the flower leaves to turn yellow? There are many reasons for flower leaves to turn yellow, the most common of which are the following factors.

1.  Illumination
After the flower receives strong sunlight, the leaves will be burned, which will cause the leaves to become yellow and withered. At the same time, the long-term insufficient light will also cause the flowers to grow poorly and the leaves will turn yellow and soft. When the light is too strong, you need to cut off the yellow leaves and put them in a cool place for maintenance. If the light is not enough, you need to put them in the sun-scattering area and receive sufficient light to slowly recover.

2. Watering
Excessive watering will cause water to accumulate in the flowerpot, and the roots of the flowers will rot, which will affect the normal absorption of water and nutrients, and the leaves will turn yellow. Therefore, it is necessary to control the water content of the flowerpot, which can be placed in a well-ventilated and bright place to allow the excess water to evaporate. 

3. Iron deficiency
If you don't pay attention to adding iron in time when raising flowers at home, the leaves of the flowers will turn yellow. Iron deficiency mainly affects the young leaves of flowers, making the mesophyll yellow. At this time, you need to choose ferrous sulfate for dilution, add it to water at a ratio of 1:50, and then spray the yellowed leaves of the flower to supplement iron in time.

4. Fertilize
If the plant lacks phosphorus, calcium, and nitrogen fertilizers, the leaves will also turn yellow. You can choose to apply an appropriate amount of thin decomposed fertilizer or compound flower fertilizer to meet the needs of plants for phosphorus, calcium, and nitrogen fertilizer. If the fertilizer is applied too much, the leaves will turn yellow due to the overnutrition of the plants. At this time, it is necessary to water in time to dilute the excess fertilizer in the pot, or to clean the roots of the plants before replanting.

5. Humidity
If the growth environment of wet-loving plants is too dry, the leaves of the flowers will also turn yellow. At this time, it is necessary to spray water around the plants in time to increase the air humidity. You can also choose to cover the top of the plant with a layer of plastic film to keep warm and moisturize and alleviate the yellowing of the leaves.

6. Soil
At this time, the soil needs to be replaced in time. If it is a plant that loves acid soil, it is necessary to choose acid soil instead of alkaline soil for planting, so as to meet the needs of plants for soil during the growth process.

7. Temperature
If the temperature is too high in summer, the plants will not be able to tolerate the high temperature, and the water will evaporate a lot, and the leaves are prone to yellowing due to lack of water, so they need to spray water in time to cool down. If the temperature is too low in winter, the plants that are not cold-tolerant will suffer frost damage, and the leaves will turn yellow and dry. It is necessary to carry out heat preservation and protection in time to ensure that the flowers grow at a suitable temperature.