Causes of and Solutions for Yellowing Leaves on Hydrangeas
In daily life, when people grow hydrangeas, they often notice the phenomenon of yellowing leaves. If it is not dealt with in time, it can easily cause the hydrangea to die outright. However, many people do not know the causes of yellowing leaves on hydrangeas, so they also do not know how to handle it. So what should be done when hydrangea leaves turn yellow? In fact, the solutions are very simple. Now follow the editor to take a look.
1. Causes of yellowing leaves on hydrangeas
1. Direct sunlight
Although hydrangeas also need light when being grown, they cannot be exposed to sunlight for a long time, otherwise the leaves of the hydrangea will turn yellow. Therefore, during the growth period, direct sunlight should be avoided. Only in this way can the phenomenon of yellowing leaves be avoided.
2. Too much fertilizer
During the fertilization process for hydrangeas, applying fertilizer that is too concentrated or applying raw fertilizer can very easily burn the roots, thereby causing the leaves to turn yellow. If the plant has not been repotted for a long time, especially if it lacks nitrogen fertilizer, the plant cannot get enough nutrients for growth, and the leaves lose green color and turn yellow.
3. Insufficient watering
Hydrangeas like a moist and shaded growing environment, and they have a relatively high demand for water. Therefore, if they are watered too little, the leaves of the hydrangea will turn yellow, and it may even cause the roots of the hydrangea to rot. So everyone should pay extra attention during care.
4. Soil is alkaline
If the soil in which hydrangeas are planted is alkaline, or if alkaline or neutral water is used for a long time, it will cause iron deficiency in the soil, and the leaf color will gradually turn yellow. The main symptoms are that the young leaves at the tips of the branches turn yellow, and the old leaves turn yellow, but the leaf veins remain green. As the condition worsens, the leaves of the whole plant will turn yellow, the leaf margins will scorch, and they will gradually fall off.
2. What to do when hydrangea leaves turn yellow
1. Reduce light exposure time
If there is too little light, appropriately increase the light exposure time, and it will slowly recover. If the light is too strong, immediately move the plant to a shaded place out of the light to avoid direct sunlight. At the same time, frequently spray water on the leaves and the surrounding environment to increase air humidity, and the leaves will gradually recover their green color.
2. Water appropriately
When too much fertilizer has been applied, immediately stop fertilizing and water a small amount. Or directly take the plant out of the pot, rinse the plant with clean water, change the soil, and replant. If yellowing leaves are caused by too little fertilizer, promptly change the soil and fertilize, watering with a dilute liquid fertilizer about once every 10 days, and the leaves will gradually turn green.
3. Replant and grow again
When too much fertilizer has been applied, immediately stop fertilizing and water a small amount. Or directly take the plant out of the pot, rinse the plant with clean water, change the soil, and replant. If yellowing leaves are caused by too little fertilizer, promptly change the soil and fertilize, watering with a dilute liquid fertilizer about once every 10 days, and the leaves will gradually turn green.
4. Change the pot and soil to prevent yellowing leaves
When planting or when changing the pot and soil, add sulfur powder to the soil to ensure the soil is acidic, and its effective period can last 2-3 years. In spring and autumn, when the branches and leaves are lush, apply alum fertilizer water once every 15 days, which can prevent the occurrence of plant chlorosis and make the leaves bright and dark green.
Conclusion: Through the detailed introduction above, I believe everyone now knows the causes of yellowing leaves on hydrangeas. Generally speaking, they are caused by sunlight that is too strong. Therefore, during care, it is best to grow hydrangeas in a shaded and humid place so that the hydrangea leaves can turn green again. Now flower lovers should already be clear about what to do when hydrangea leaves turn yellow.