The answer to 'drainage system weeds' is that weeds growing in your drainage system are a common problem that can lead to clogs and water backup. Weeds can take root in the soil and gravel around your drainage pipes, eventually growing into the pipes themselves and blocking the flow of water.
Some common causes of drainage system weeds include poor initial installation, damage to the pipes over time, and soil erosion around the pipes. Symptoms include standing water, slow drainage, and visible weed growth around the drainage system. To solve the issue, you'll need to clear out the weeds and debris, repair any damaged pipes, and potentially install additional drainage or landscaping features to prevent future weed growth.