The answer to 'why is my retaining wall weeds' is that weeds can easily take root in the soil and cracks of a retaining wall. Common causes include poor drainage, insufficient soil coverage, or lack of regular maintenance. Weeds can damage the structural integrity of the wall over time and detract from the overall appearance of your landscaping.
To address this issue, it's important to regularly inspect and maintain your retaining wall. This may involve removing weeds by hand, applying a pre-emergent herbicide, or ensuring proper soil coverage and drainage around the wall. In some cases, you may need to repair or replace sections of the wall to prevent future weed growth.