I will be very interested to hear what you find, Maurice. I have (and love) both Volcan Fuego and H. Hakuunensis. As others have noted, they're both late blooming anyway, and I have never seen any rebloom. This fall was very warm very late (although puntuated by a couple of early frosts), but still I did not have any rebloom on these two, though I had quite a bit on other unusual suspects.
