I agree...wait till March lst to move it...
From my experience in moving a butterfly bush and other perennials
it is really to late to take the chance..in mid sept
I hear this winter is to be way colder and wetter
in zone 8b and in higher up areas ice and snow
more so this winter...
Just my advice..not that I am correct on anything
but I would make myself wait till March lst and move it
then or mid march..
I just planted a Wendys wish..but it was a week ago..
I was hesitant on planting it then but I would not
this week ...
Sheri dragonfly in alabama zone 8b