Chelle, Mine is still blooming, and it was 104 here yesterday. They have bloomed really well this year. I've got a few that took a bit of a break, but for the most part, they have bloomed non-stop as long as I keep up with the deadheading.
Cinda, thanks for the info. I know about spade pruning or dividing, but I'm hoping to get them started by breaking off a section instead. The plants are really round, and I'm not sure they would look good as half circles!