In what I have experienced over my three attempts before, Sept is like a transition month. The plant may catch up with some blooms..but our overnight temps gradually starts to go down by the end of Sept. Our daytime is still high, but the overnights are getting cooler slowly.
I am glad you brought up this thread..made me read the previous entries..so it seems in one of my early attempts I did get a little bloom, but no roots, and in September too. So maybe in my hot and dry area, it prefers September for its bloom time.