The answer to 'why is my deck overgrown' is that your deck likely needs regular maintenance and cleaning to prevent the growth of weeds, moss, and other vegetation. Over time, organic matter can accumulate on the surface of your deck, providing a fertile environment for plants to take root and spread.
Some common causes of an overgrown deck include lack of regular cleaning, poor drainage, and excessive shade or moisture. Symptoms may include visible weeds, moss, or other plants growing on the surface of the deck, as well as discoloration or deterioration of the wood. To address an overgrown deck, you can try DIY cleaning and maintenance, but for more severe cases, it's best to call a professional landscaping or deck repair service to properly assess and treat the issue.