I'm surprised that my Asclepias tuberosa is still blooming intermittently; last year it was done in mid-August, if I recall correctly.
I was able to rejuvenate one of my Rudbeckia hirta plants by cutting off the spent blossoms, causing a bit of late-season back budding. In the background are some weedy wild Asters. I allow several these to stay in my garden because they make nice filler plants in the fall.
Clematis ternifolia or Sweet Autumn Clematis. Believe it or not, there is actually a trellis under that mound of flowers and foliage. I planted both Clematis 'Jackmanii' and the C. ternifolia at the base of my trellises, so I get two season of bloom, with the former flowering in June, and the latter in late August through September.
View with both trellises. The C. ternifolia vines actually trail across the Buddleia planted between them.
Symphyotrichum novae-angliae, (aka Aster novae-angliae or New England Aster). This beautiful plant came up out of nowhere in my garden last year. I have never planted a New England Aster, as I almost never see them for sale around here. So I have no idea where it came from. The nurseries usually carry numerous cultivars of Symphyotrichum novi-belgii (New York Aster.)
It's life among the weeds in my backyard. This volunteer morning glory (Ipomoea species) came up a few feet from the planter box where I had grown morning glories last year.
Pelargonium behind my Sansevieria hallii. The new Sans leaf that emerged this spring (second from the right) is now the largest on the plant.
I will try to remember next month's Bloom Day, which coincides with the average first frost day around here, and hope that I will have something still blooming to share.