Causes and treatments of yellow leaves of calendula

1. Improper fertilization

1. Reason: If no fertilizer is applied or insufficient fertilizer is applied for a long time during the growth period, yellow leaves will occur. When too much fertilizer is applied, it will be difficult for marigolds to absorb the excess fertilizer, which will cause root burns and affect the absorption of water and nutrients.

2. Treatment method: Fertilize once a week in summer, and avoid excessive fertilizer. If you apply too much fertilizer, you can water more to dilute the fertilizer in the soil. Lack of fertilizer will cause the soil to become compacted. Fertilizer should be applied immediately. The effect will be seen within a week. Fertilizer should be applied on schedule thereafter to ensure the normal growth of the flowers.

2. Pest and disease damage

1. Reason: The yellowing of calendula leaves is often caused by mosaic disease, and the leaves will turn yellow and have yellow-green spots.

2. Treatment method: Pay attention to timely prevention of diseases, increase fertilizer and water management, spray pesticides in time and provide sufficient light and ventilation.

3. Plants lack water

1. Reason: Calendula needs sufficient water during its growth period. If it is not watered for a long time or is watered too little, the plant will lack water, causing the leaves to droop and turn yellow.

2. Treatment method: At this time, spray water on the leaves immediately, and then water the pot. Pay attention to gradual watering and do not water too much at one time.