The answer to 'why is my retaining wall bare spots' is that the soil and vegetation on the retaining wall have become eroded or worn down over time. This can happen due to factors like heavy rainfall, runoff, lack of proper soil coverage, or improper installation. Bare spots on a retaining wall can lead to further erosion and potential structural issues if not addressed.
To fix bare spots, you'll first need to identify the cause. If it's due to poor soil coverage or improper installation, you may be able to DIY the repairs by adding new topsoil, mulch, or other ground cover. However, if the issue is due to structural problems with the retaining wall itself, it's best to call in a professional landscaper or contractor to assess and repair the wall properly.