The answer to 'why is my shrub' is that there could be several common causes, including improper watering, pests or diseases, or environmental stress. Symptoms may include wilting, discoloration, or abnormal growth. The best solution depends on the specific issue, but may involve adjusting watering, treating pests or diseases, or providing better growing conditions.
If the issue is minor, you may be able to diagnose and fix it yourself. However, for more serious or persistent problems, it's best to call in a professional landscaper or horticulturist. They can properly identify the cause and recommend the most effective treatment to restore your shrub's health.