Mine stopped blooming a couple of weeks ago too after being a blooming machine all summer. I cut it back but have not fed it yet and am hoping that will bring it back to life. I'd heard they would bloom until a freeze.

Mine never regained its flower power, but it is alive and I hope it will make it this winter. I'm already missing it.

Mine has been blooming again and looks great. The haircut seems to have helped.

This bed looked fabulous a few weeks ago, and then they all just stopped blooming. The ones in my front bed look fine. The plants in my front bed look fine. I hope somebody can give us an answer!

Shear them back by 1/3, osmocote, water, wait.

Though I like Osmocote for early season fertilization, I would use something fast acting now. Ironite is not a good choice, you need something with a broader nutrient value.....including nitrogen.