I did not see any hummers taking an interest, so far, but did see several kinds of wasps or hornets paying a lot of attention to these blooms. It looks like it will be my plants' best crop of blooms yet. About 10 that are noticeable and a few more still in the tiny, weird looking stages.
Lin, I forgot to ask. When were those pics? What month? Do Hoyas bloom at a particular time where you are, or more than once per year?