The answer to 'stone walkway dying plants' is that the most common causes are poor soil drainage, excessive shade, or root competition from nearby plants. Symptoms include yellowing, wilting, or stunted growth of the plants along the walkway. Solutions may include improving soil drainage, adding mulch, or transplanting or removing competing plants.
If the issue is widespread or you're unsure of the cause, it's best to consult a professional landscaper. They can assess the site conditions, diagnose the problem, and recommend the appropriate treatment to revive the plants and maintain the health of your stone walkway.