Causes and treatments for yellowing hollyhock leaves

1. The temperature is not suitable

1. Reason: It likes warmth. If the temperature in the breeding environment is very high or very low, it may not be able to adapt and will have yellow leaves.

2. Treatment method: Provide it with a suitable environment, and take cooling and warming measures in hot summer or frosty autumn and winter. Use a shade net for shade in summer and move it indoors for the winter.

2. Improper watering

1. Reason: It does not require much water, but long-term water shortage during the growing period will cause its leaves to turn yellow. If you water too much, waterlogging will occur, damaging the roots and making it unable to absorb nutrients, causing the leaves to turn yellow.

2. Treatment method: Water on time and do not use contaminated water for watering. If you water too much, stop watering. You can open the soil in the pot to deal with the rotten roots, change the soil and replant.

3. Occurrence of pests and diseases

1. Cause: Old plants that have been in business for many years are susceptible to a type of hollyhock rust, which can cause the leaves to turn yellow or wither. Or if red spider mite infestation occurs during the growth period, the plant will be damaged and poor absorption will lead to yellowing.

2. Treatment method: Remove the diseased leaves in time and keep the plant ventilated and light-permeable. Use some phosphorus and potassium fertilizers, and don't use nitrogen fertilizers. Appropriate use of appropriate pesticides such as oxycarboxin for drug control.