Hoya imperialis has been one of my signature Hoyas now for well over a decade. I have flowered them dozens of times over the years, but for the past couple of years I have struggled with them. I simply could not figure out why they would no longer grow for me for months on end. I made no sense at all. I now believe that once again flat mites were causing all of my problems with stunted and deformed plants. Since spraying my Hoya imperialis have been doing far better. Here is Hoya imperialis Palawan from yesterday: