These are always something of a quiet surprise for me, I forget about them every year and they emerge in mid summer, usually. I am probably doing everything wrong because I see they are supposed to prefer full sun or light shade, yet in my garden are found beneath a towering umbrella of perovskia, with an enormous buddleja in front of that, so hardly any light. But they just seem to have made that patch of ground their own. If anything I think they're even prettier after flowering, when they just seem to flop into this languorous pose with the leaves seeming to multiply. As you can see from the second photo in particular though, some leaves are now browning a little and I'm wondering what to do as we head into autumn. Is there a good time for dividing stachys, or ought I to just leave them to do their own thing? Should I lop off any unhealthy looking leaves?