The answer to 'hedge dying plants' is that there are several common causes, including pests, diseases, improper watering, and environmental stressors. Symptoms may include wilting, discoloration, or dieback of the leaves and stems. Solutions can range from pruning and treating pests/diseases to adjusting soil and irrigation.
If the issue is caught early, some hedge problems can be resolved with proper care and maintenance. However, severe or persistent issues may require the expertise of a professional landscaper to properly diagnose and treat the underlying cause.