Diagnosis
Diagnose: Kentucky Bluegrass Thin Lawn
Use these observations to decide what to check next.
A site condition is removing crowns faster than rhizomes can replace them
Start with the soil rather than the color. Open ground with missing crowns is a thin lawn, while intact straw-colored turf over firm crowns is usually dormancy.
Gaps that follow shade, a footpath, hard soil, or a repeating ring are telling you where to look.