There could be a number of reasons why viburnum leaves are turning yellow, including nutrient deficiencies, disease, pests, or environmental stress. One common cause is a lack of iron in the soil, which can lead to chlorosis and yellowing of the leaves. Other possible causes include water stress, fungal diseases, or insect infestations. Testing the soil and examining the plant for signs of pests or disease can help pinpoint the cause and guide appropriate treatment.
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