What is the reason why Calendula leaves turn yellow

The reason why Calendula leaves turn yellow

Some varieties of Calendula have larger flower types, more roots, more water and fertilizer, and small pots can not meet their growth needs. At this time, the old leaves will be dry, yellow and lusterless, and the young leaves will be thin. In order to ensure the normal growth of flowers, it is necessary to change basin for several decades and add 30% rotten soil to the soil.

The second reason of Calendula leaves yellow: lack of water

If the watering is reduced, the leaves of plants will droop. At this time, spray water on the leaves immediately, and then water in the basin. When watering, pay attention to step by step, and do not water too much at one time.

When the weather is dry and the indoor humidity is low, yellow leaves will also appear. Especially in winter, the incidence of coal fire and heating is more serious. At this time, spray the branches and leaves with water close to the room temperature to increase the air humidity. In summer, water is often sprayed on the ground, which makes the local environment moist.

The third reason of Calendula leaves yellowing: improper fertilization

During the growth period of calendula, long-term non fertilization or insufficient fertilization will cause yellow leaf phenomenon. When fertilization is too much, it is difficult for flowers to absorb excessive fertilizer, which will cause root burn and affect the absorption of water and nutrients.

Fertilize once a week in summer. Do not over fertilize. If too much fertilizer is applied, more water can be used to dilute the fertilizer in the soil. Lack of fertilizer will lead to hardening of soil, fertilizer should be applied immediately, effective within a week, and then fertilizer should be applied on schedule to make flowers grow normally.

The reason of Calendula leaves yellow: cold

Calendula leaves the room earlier, is attacked by the cold wind, or the autumn cold does not enter the room in time, so that the flowers are frozen and cause yellow leaves. So in early spring and late autumn, we should do a good job in cold prevention.

The fifth reason of Calendula leaves yellow: disease and insect damage

The phenomenon that Calendula leaves turn yellow is often caused by mosaic of yellow and green. It is necessary to prevent the disease in time, spray medicine in time and give sufficient light and ventilation. (☞