The roots can be divided in mid-summer, IF you can find them since it dies down in early summer. It self seeds prolifically and the young plants are easily transplanted.

Kris, where are you located?

I just received some Va BB rhizomes from Vernon Barnes & Son, McMinnville, Tenn. I ordered a ton of plants and received nearly 50% discount, Free shipping and 10 free small bareroot trees.
If interested, go to GWD and click on their name for address, phone & fax #'s. Can also Google and find info.
They have no WS or email, but will send catalog upon request.
Rb

I cannot tell what zone you are in, but in zone five our Virginia Bluebells will start coming up in March. I have dug and shipped quite a few starts to people and they have done good. It is easy to ship when they first come up. If you let them get too tall they will not do as well. In the spring I always have many babies to share.
Many years ago I tried seeds and some starts that I ordered but it never worked for me. A neighbor in IL had some and the seeds flew over into our garden and I have them from that time. We now live in MI and they are doing well here. I think there is nothing as beautiful in the spring when they start to bloom with the daffodils and other spring flowers.