Have you seen a panicle hydrangea (Hydrangea paniculata, Zones 3–8) advertised to get some pink or even red in its bloom?  This color change often happens as the flower antiques (fades).  This is aided by cooler night temperatures.  

The Southeast is not known to provide cool night temps in the summer!  But is there still a way?  I think so, I prune all of my panicle hydrangeas in late June.  This might seem strange.  However I explain it all in this article.

https://www.finegardening.com/article/summer-pruning-panicle-hydrangeas-in-the-southeast

Has anyone else tried this?