The answer to 'why is my sod thin grass' is that there are several common causes, including improper installation, poor soil conditions, lack of water, and weed competition. Thin, patchy sod is often a sign that the grass is struggling to establish deep, healthy roots.
Some of the most common symptoms of thin sod include visible soil between grass blades, stunted growth, and a dull, discolored appearance. To fix this issue, you'll need to identify and address the underlying cause, whether that's amending the soil, increasing watering, or removing weeds. In many cases, overseeding or resodding may be necessary to thicken up the lawn.