The answer to 'mulch drainage problems' is that poor drainage under mulch can lead to a variety of issues, including waterlogging, mold growth, and plant health problems. Common causes include compacted soil, improper mulch depth, and lack of soil aeration.
Symptoms of mulch drainage problems include standing water, soggy soil, and yellowing or wilting plants. To solve these issues, you may need to aerate the soil, adjust the mulch depth, or improve the overall drainage in the affected area. In some cases, you may need to consult a professional landscaper to address more complex drainage problems.