Why does Serissa japonica (snowbush) have yellow leaves and leaf drop? Bonsai cultivation methods and precautions

Today I introduce a flowering plant that is both ornamental and has medicinal value: Serissa japonica (snowbush). In appearance, its flowers are elegant, its flower shapes and green leaves are lush, and the overall feeling is like a dreamy fairyland, which is why it is loved by many flower lovers. However, during care, many flower lovers say that the Serissa japonica they grow always has headaches such as yellowing leaves and leaf drop. The following addresses the problem from multiple aspects.

Generally speaking, when yellowing leaves or leaf drop occur during Serissa japonica care, the first thought is to suspect that the plant may be in an unhealthy state. However, there are actually exceptions: when the plant is continuously sprouting new leaves, it will naturally eliminate some old leaves, and at this time yellowing and falling leaves appear. This is normal metabolism and development, so there is no need to worry too much.

Apart from natural metabolism, another possibility is improper watering. For example, too much watering can cause waterlogging in the soil, which then affects root respiration and causes yellow leaves and leaf drop. If watering is too little, it will lead to water shortage, and the leaves are the first to show it, becoming wilted and yellow.
Then, yellow leaves or leaf drop are also related to soil problems, because soil quality directly affects normal growth. At this time, flower lovers can check whether the soil has become compacted or has poor air permeability. If this problem exists, yellow leaves form because water and nutrients cannot be absorbed. It is recommended to repot in time and replace it with new soil with good air permeability. Only in this way can root health be ensured and the occurrence of yellow leaves and leaf drop be reduced.

Next, because Serissa japonica is a light-loving plant, if it lacks sufficient light for a long time, the plant will be unable to carry out photosynthesis, which then leads to yellowing leaves and poor growth. It is recommended to move it promptly to a balcony or windowsill. If the light is still insufficient, artificial intervention with a grow light is needed for supplemental lighting.
Finally, what may cause yellow leaves on Serissa japonica may also be pests and diseases. Although it does not easily get sick, different care environments may produce fungal infections or pest damage. Therefore, it is recommended to ventilate regularly when caring for it indoors, or use tools such as a fan to enhance air circulation.