The answer to 'retaining wall disease' is that retaining walls can suffer from a variety of issues, including structural damage, soil erosion, and plant growth. Common causes include poor construction, improper drainage, and weathering over time. Symptoms may include cracks, leaning, or bulging walls, as well as vegetation growing through the structure.
In many cases, minor issues can be addressed through DIY repairs, such as clearing debris, repairing cracks, and improving drainage. However, more serious structural problems often require the expertise of a professional landscaper or mason. They can assess the extent of the damage, identify the root cause, and recommend the best course of action, which may involve partial or full wall replacement.