The answer to 'lawn thin grass' is that a thin, patchy lawn is often caused by a combination of factors, including poor soil, lack of nutrients, drought, pests, or disease. Symptoms include bare spots, sparse grass coverage, and a generally unhealthy appearance.
To address a thin lawn, start by identifying the underlying cause. This may involve testing your soil, inspecting for pests or disease, and evaluating your watering and mowing practices. Overseeding, aerating, and applying the right fertilizer can help thicken up the grass. However, if the problem is more severe, you may need to consider re-sodding or re-seeding the entire lawn, which is typically best left to a professional landscaper.