2 questions:Autumn Joy sedum grows well for me but by Sept. the flower heads...
Autum Joy gets pretty floppy. Some people like to cut them back once they are about 6-8" tall. Remove about half of the height. This will keep them a little shorter and hopefully more upright, but will also delay blooming by a few weeks. Other gardeners feel that dividing their sedum every year or two helps, as does keeping them in a very sunny, dry area. Rich, moist soil encourages lush growth that cannot hold itself up. Still others replace their Autum Joy with newer cultivars that don't flop.
Rudbeckia's septoria leaf spot can be hard to control (http://www.extension.umn.edu/garden/yard-garden/flowers/diseases-of-rudbeckia/ and https://ag.purdue.edu/btny/ppdl/Pages/POTW_old/9-30-13.html). 'Goldstrum' is the most common kind of rudbeckia and it is very susceptible. ‘Becky’, ‘Cherokee Sunset’, ‘Irish Eyes’ and ‘Prairie Sun’ are more resistant.