The naked lady on the left is one that was from a division last year, the one on the right hasn't been done in 7 years or so, and if I wanted to, is ready for division this fall. However, I can leave it there for years and it will be fine. It will divide and spread and get more stems like this one has
(we went through a lengthy period where the rainfall was minimal, that's why you see so many brown leaves. In my garden once the plants are established, they're on their own - no extra watering)