Premature flower drop in viburnums can be caused by a few factors. One common cause is environmental stress, such as drought or excessive heat. Another possible cause is improper pruning or trimming, which can damage the plant and cause it to drop its flowers. Additionally, pests such as aphids or spider mites can cause flower drop. Ensure that your plant is getting adequate water and sunlight, and address any pest or pruning issues as needed.
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