The answer to 'why is my hedge dying plants' is that there are several common causes, including improper watering, pests, disease, or environmental stress. Symptoms may include wilting, discolored or dropping leaves, and dieback of the branches.
To troubleshoot the issue, first check the soil moisture - hedges need consistent watering, especially during dry spells. Look for signs of pest infestations like aphids or mites. Diseases like fungal infections can also cause hedge decline. Environmental factors like too much sun, wind, or frost can also stress and weaken the plants over time.