The answer to 'aeration turning brown' is that brown spots after aeration can be caused by several factors, including drought stress, poor soil conditions, or fungal diseases. Aeration is a common lawn care practice that helps relieve soil compaction and improve water and nutrient absorption, but it can also temporarily disrupt the grass and make it vulnerable to other issues.
If the brown spots appear shortly after aeration, it's likely due to the disruption of the grass roots. This is normal and the grass should recover within a few weeks with proper care. However, if the brown areas persist or spread, it could indicate an underlying problem like drought stress, poor drainage, or a fungal disease that may require professional diagnosis and treatment.