What causes the leaves of calendula to turn yellow?

The reason for the yellowing of calendula leaves is: the flower is too big and the pot is too small

Some varieties of calendula have larger flowers and more root systems, and require more water and fertilizer. Small pots cannot meet their growth needs. At this time, the old leaves will become dry, yellow and dull, and the young leaves will be thin. The pots need to be changed every few decades, and 30% of humus should be added to the soil to ensure normal growth of the flowers.

The second reason why the leaves of calendula turn yellow: lack of water

Reducing watering will cause the leaves of the plant to droop. At this time, you should immediately spray water on the leaves and then water the pot. When watering, pay attention to gradual progress and do not water too much at one time.

Yellow leaves may also appear when the weather is dry and the indoor humidity is low. The disease is more serious in areas where coal fires and heaters are used for indoor heating in winter. At this time, you should frequently spray the branches and leaves with water close to room temperature to increase the air humidity. In summer, water is often sprinkled on the ground to make the local environment moist.

The third reason for the yellowing of calendula leaves: improper fertilization

During the growth period of marigold, if no fertilizer is applied or insufficient fertilizer is applied for a long time, yellow leaves will occur. When too much fertilizer is applied, the flowers will find it difficult to absorb the excess fertilizer, which will cause root burns and affect the absorption of water and nutrients.

Fertilize once a week in summer and avoid excessive fertilization. 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.

The fourth reason why the leaves of calendula turn yellow: cold

Calendula is taken out of the house too early and is blown by the cold wind, or it is not brought indoors in time in the cold autumn, causing the flowers to freeze and the leaves to turn yellow. Therefore, we must take precautions against cold in early spring and late autumn.

Reason 5 for the yellowing of calendula leaves: pests and diseases

The yellowing of calendula leaves is often caused by mosaic disease. The leaves will turn yellow and have yellow-green spots. Pay attention to prevent diseases in time, spray pesticides in time, and provide sufficient light and ventilation. (☞ Calendula diseases and prevention methods )