Night Embers is a very strong grower in my zone 3a garden, multiplied really well, it has sturdy scapes, but low bud count, and I do not get fully double blooms, most are single. I divided it this fall. I did get it to set a few pods a few years ago and got a couple of very nice seedlings.
Seedling #1Night Embers X Kasbah Fez, shows signs of doubling but in my climate it is usually single, it is a strong grower, has many fans and strong scapes with blooms high above the foliage, fairly high bud count. It is striking in the garden.
Seedling #2 Night Embers X Kasbah Fes, sibling to the one above is a beautiful red, with the same traits, quickly formed a clump, it has also shown some double traits but most are single. One of my favorites in the garden.