I don't know what is happening with my luxuriant, eek! The following picture may not show it (I have a cheap camera lol), but more flowers are becoming brown, even new ones. Yes, we have been experiencing high temperatures here as well as high humidity. Research online continually seems to confuse me, because some say it's ok to be in full sun, and others say partial shade.
My luxuriant gets morning sun for about five hours, then shaded because it sits on a balcony ledge. I am guessing the browning is because of heat and humidity, but it's only a guess. I have decided to bring it inside where it will be cooler because we are expecting high temperatures all this next week, and hoping that will help?
