The answer to 'how to maintain retaining wall' is to regularly inspect, clean, and repair your retaining wall to ensure its structural integrity and prevent damage. This includes checking for cracks, erosion, and proper drainage, as well as removing any debris or vegetation that could compromise the wall.
Maintaining a retaining wall typically involves clearing away leaves, branches, and other debris at least twice a year, in the spring and fall. You should also visually inspect the wall for any signs of damage, such as cracks, bulges, or leaning, and address any issues promptly. If you notice significant damage or deterioration, it's best to consult a professional landscaping or masonry contractor for repairs.