And they way they are petering out at this time of year is evidence toward Silene, for Slowcala's plant(s), from what I've seen. I haven't had any Phlox in the south but my Silenes are about done, usually don't last long once the heat sets in, or maybe it's day length, IDK for sure.
@ATLDB where you you? Generally, if you don't want us stalking your plants. LOL!