I wouldn't. Not right now, but would wait till first signs of growth in spring.

Cheers, campanula

Thanks, @HU-618169007

I saw this on Gardenia net website:

Just wondering if people have divided in fall themselves?

I follow the midsummer rule - anything which flowers before midsummer gets divided/transplanted in autumn...so they have a chance to put on some rootgrowth without the extra energy needs of flowering. Later bloomers such as asters and such are much happier with divisions done in spring, when they have 3 months or so to make up some decent rootgrowth at the start of summer, before the stress of flowering.

HOWEVER, in emergency, I have risked dividing, moving etc. when I get the chance to do so...and providing one is careful and observant, the plants are mostly OK...

The midsummer rule makes a lot of sense. I have two for each and will venture to divide one for a try