The answer to 'why is my lawn erosion' is that there are several common causes of lawn erosion, including heavy rain, poor soil drainage, steep slopes, and excessive foot traffic. Symptoms of lawn erosion can include visible gullies, ruts, and bare patches in the grass. Solutions may include improving drainage, adding topsoil and grass seed, installing erosion control measures like retaining walls or terracing, and adjusting your mowing and foot traffic patterns.
If the erosion is severe or you're unsure of the best approach, it's generally a good idea to consult a professional landscaper. They can assess the specific causes and recommend the most effective and long-lasting solutions for your lawn.