I had to get the most out of the Hoya patella flower that I cut off so here it is against Hoya australis ‘Lisa’:

These are both flowering right now so why not?

Here is a photo of a Hoya patella flower sitting on the Hoya vangviengiensis blooms:

There is not much going on right now so as long as I have multiple flowerings going on, I will continue to show flower comparisons. Here is an actual Hoya australis Lisa flower that I inserted and photographed. It is circled but I think it would have been easy to pick out even without the circle.

Both of these are flowering at the same time – so why not?

The blooming periods of these both briefly overlapped so I took this comparison photo while I could.

I feel very privileged to have flowered Hoya vangviengiensis and don’t expect to be able to do it again in the future. It loves cool, humid conditions and as such does not make a very good houseplant here in the Northeast because of the dry air in our centrally heated houses in the winter time. I have tried growing it on a windowsill during the winter and it shuts down completely without the humidity. The flowers are very powerfully scented especially in a cool enclosed area like my basement grow tent.

For someone wanting a challenge, or who lives in a naturally cool, humid area like say San Francisco, I can highly recommend the plant!

According to Rodda & Simonsson who published the species, Hoya vangviengiensis has only been found growing epiphytically, mostly on smaller moss covered branches. It is found in shaded limestone areas where it is provided with mostly cool humid conditions year round. This is a species that is found close to the northern limits for Hoyas and as such can survive some pretty cool temperatures.

Hoya vangviengiensis, like Hoya carnosa, has clear sap. The foliage is lightly pubescent as can be seen in my photos below.

Hoya vangviengiensis is name for the location where it was first found in Vang Vieng, Laos in 2010. In 2015 was also discovered in Yunnan Province, China; it was grown out and confirmed to be the same species in 2017.