It wasn't until 9:30am that I noticed the crust of ice in the birdbath.
The temperature certainly dipped below freezing at sometime during the darkside of the morning. Silly old me almost ignored the frost advisory ... many of the potted plants would have been damaged or killed if I had left them out.
Our first perennial Dianthus bloom of this year didn't give a damn about the frost.
We only have one area in our gardens that the Dianthus finds favorable enough to overwinter.