Can I still divide them then transplant them to another location?
I doubt there'd be a problem with that... I got rid of the ones I had because they seeded around too much - I'm still digging out seedlings years later!
Mine has been so well behaved. Today, I only moved penstemon and veronica.
Even though this is considered a common plant, I still adore it. I have them everywhere.
I've tried both fall and spring dividing with these and believe the spring divisions do better for me. They just seem to recover quicker.