We just had another home disaster (flood)* and 2 days ago I noticed this odd spot on our lawn. We're on sewer and live on a suburban street. The patch is sort of square/baseball diamond shaped and at least several feet across. We don't take good care of our lawn but didn't have this problem last year. We don't have sprinklers. I spread weednfeed a few months ago but this spot is too clearly delineated for it to be that. What could it be?
*Not that I think they're related, just that I don't need another home disaster!