Hoya cv. Kaimuki is a cultivar developed by Michael Miyashiro of Hawaii that combines H. macgillivrayi and H. archboldiana. I received this plant in the summer of 2012. It arrived with rotted roots so I needed to take a cutting and start the plant over from scratch. It quickly rooted and I was able to flower it nine months later in the spring of 2013. I believe that most of my luck with the macgillivrayi/archboldiana complex stems from giving the plant continuous 12 hour days, which are only achieved around here by using grow lights. This plant has huge bloom, which measure 3 inches across from point to point, and they are very long lasting – up to two weeks.
I also find that this complex can have huge variation in flower color depending on how it is grown. I would not be surprised if the next time I flower this plant it would bloom all red.