Reason: Viburnum is not hardy, suitable to grow in a warm environment between twenty to thirty degrees Celsius. In winter, when there is not enough sunshine, cold wind is too strong and the temperature is too low, it is easy to frostbite the plant and the leaves turn yellow.
Measure: When the temperature is low in winter, it needs to be moved to a warm room or greenhouse for maintenance.
2. Insufficient light
Reason: The flower prefers to grow in a sunny environment, and will only grow fast if there is enough light. If there is not enough light, its natural growth is poor, and the leaves will gradually turn yellow.
Measures: Move it to a sunny place to maintain, if the outside sunlight is not enough, you need to make up the light artificially. In winter, when there is enough light outside, you can move out to receive light at the right time, but pay attention to wind protection.
3. Insufficient water
Reason: the growth of the flower has a greater demand for water, the soil should always be kept in a moist state. If there is not enough water, the soil dries up and the leaves will yellow.
Measures: Water in time, control the amount of water, water when you see the surface of the soil becomes dry, watering should be watered thoroughly, pay attention to not appear stagnant water situation.
4. Soil Discomfort
Reason: The soil of the flower needs to be well-drained and breathable, which is favorable to its growth. If the soil is not suitable, it is easy to impede its growth, which leads to the problem of yellow leaves.
Measures: You can replace the general garden soil, mixed with some gravel and humus to enhance drainage and permeability.