The answer to 'why is my shrub dying plants' is that there are several common causes, including overwatering, underwatering, disease, pests, or improper planting. The shrub may show symptoms like wilting, yellowing or browning leaves, stunted growth, or dieback of branches. To troubleshoot the issue, first check the soil moisture and adjust watering as needed. Inspect the shrub for signs of disease or pest infestations, and prune out any damaged or dead parts. Make sure the shrub is planted in the right spot with the proper sunlight and soil conditions.
If the problem persists despite your efforts, it's best to consult a professional landscaper or horticulturist. They can diagnose the underlying issue and recommend the appropriate treatment or replacement options.