The answer to 'drainage system dying plants' is that a failing or inadequate drainage system is a common cause of plants dying in the landscape. Symptoms include waterlogged soil, yellowing or wilting leaves, and stunted growth. The solutions depend on the specific drainage issues, but may involve installing new drainage pipes, improving surface grading, or amending the soil to improve drainage.
If the drainage problems are widespread or severe, it's best to call in a professional landscaper or drainage specialist to assess the situation and recommend the appropriate solutions. They can identify the root cause of the drainage issues and design an effective drainage system to keep your plants healthy and thriving.