The answer to 'retaining wall has weeds' is that weeds growing in a retaining wall are a common issue caused by soil and moisture buildup behind the wall. The symptoms include unsightly weeds poking through the wall and potential damage to the wall structure over time. The solution often involves removing the weeds manually, improving drainage behind the wall, and applying a weed-preventing barrier.
Homeowners can often address this problem themselves, but it's important to be careful when working near a retaining wall to avoid destabilizing it. For more complex issues or if the wall shows signs of structural damage, it's best to call in a professional landscaper or masonry contractor to assess and repair the wall properly.