The answer to 'mulching dying' is that mulch can cause problems if it is applied incorrectly or in excess. Overmulching can lead to issues like suffocating plant roots, encouraging pest infestations, and promoting fungal growth. Symptoms of mulching problems include yellowing or wilting leaves, stunted growth, and decay at the base of plants.
To fix mulching issues, first remove any excess mulch, making sure the soil is visible around the base of plants. Apply a 2-4 inch layer of fresh, high-quality mulch, keeping it several inches away from plant stems and trunks. Monitor the mulch and replenish as needed, but avoid letting it build up over time. If problems persist, it's best to consult a professional landscaper who can assess the specific issues and provide tailored solutions.