Hoya rosarioae was first collected by Dr. Simeona V. Siar in the Philippines in 2007 and was named after Marylin Rosario, Los Banos, Laguna, Philippines. It was published by Kloppenburg & Siar in 2009.
Hoya rosarioae is very similar to Hoya obscura but has smaller flowers, much longer peduncles and the pollinina are much shorter. This information comes from a Dale Kloppenburg publication, but I can attest that this plant is a different animal than H. obscura. I have tried to grow Hoya obscura on two seperate occasions and failed – it won’t grow for me under my conditions, but Hoya rosarioae grew very easily.
I purchased the plant as a cutting from Ric Morier of Florida in the middle of the summer growing season of 2017. I grew it in a series of net pots using my regular chunky mix and it grew rapidly. It took a fair amount of moisture, but growing it was completely unproblematic, and it flowered between 6 and 7 months from cutting. You can’t ask for more than that from a plant!
I read numerous places online that the flowers smell sweet and faintly of roses. Unfortunately, I can not attest to it, as at the time of the flowers opening, I had a tremendous cold and could not smell anything. The flowers only lasted about four days and fell off over night.
Hoya rosarioae is a fantastic plant that I can’t recommend highly enough. It makes a perfect specimen for the light garden and doesn’t get too large too quickly. It flowers at a very early age and the flowers are supposed to smell sweet. It doesn’t get much better than that.