What happened to the yellow leaves of Catharanthus roseus?

First, appropriate amount of watering

Reason: Catharanthus roseus leaves yellowing may be due to too little or too much watering, too much will cause rotten roots, new leaves yellowing, too little watering leaves yellowing due to lack of water or too few leaves, resulting in a decrease in the number of roots.

Solution: control watering and pay attention to drainage in rainy season. The basin soil should also be watered thoroughly after it is dry.

2. Appropriate lighting

Reason: the yellowing of the leaves of Catharanthus roseus may also be caused by exposure to the sun. In summer, when the sun is strong at noon, the sun shines directly on the plant, causing the leaves to turn yellow.

Solution: avoid direct light, do a good shading treatment in time, spray water to the leaf surface to reduce the temperature.

3. Suitable temperature

Cause: temperature discomfort, if the temperature is too low, less than 5 degrees prone to freezing injury will also lead to leaves yellowing.

Solution: move to indoor breeding in time in winter and control the temperature.

4. Appropriate amount of fertilization

The problem of fertilization, excessive use of fertilizer will burn seedlings, or lack of fertilizer will also cause leaves to turn yellow.

Solution: fertilization can be carried out alternately with liquid fertilizer and compound fertilizer, and do not apply fertilizer casually. If you apply too much fertilizer, you should water it in time the next day and dilute the fertilizer.