The answer to 'drainage system dying plants' is that a failing or inadequate drainage system is a common cause of plants dying in a landscape. Symptoms can include waterlogged soil, yellowing or wilting leaves, and stunted growth. The most common solutions are to improve the drainage by installing a proper drainage system, amending the soil, or adjusting the landscape grading.
If the drainage issues are severe or widespread, it's best to call in a professional landscaper to assess the problem and recommend the appropriate solution. They can evaluate the entire drainage system, identify the root cause, and implement a long-term fix. DIY solutions may provide temporary relief but often don't address the underlying problem.