Hoya yuennanensis was first collected in 1915, but was not published until 1936. In 1977 botanists Tsiang & Li believed that H. yuennanensis was a synonym of H. lyi, but Michele Rodda in 2012 said that they are clearly two separate species.

I received Hoya yuennanensis as a tiny four leaf rooted cutting in the spring of 2016. It came from an order that I made from Torill Nyhuus using Julie Kennedy as an intermediary. This was the same order that included the all white flowered Hoya Bella (PES-03). I wish that I could say that this little cutting did well for me out of the gate, but it grew only sporadically and not particularly well at any time. The usual pattern was that I would grow it for around 6 months and be forced to start it over. The plant was exceptionally easy to root; it would put on a few leaves and then just languish and usually need to be started over again because of root rot.

Months of bad growing, slowly turned into years of struggle with this plant. I had tried it in every Hoya growing mix known to man, but always the same pattern of re-root and deterioration would repeat. I came close to throwing it out on numerous occasions, but was loathe to, because it was one of only a couple of plants that I had in my collection from the legendary Toril Nyhuus. I have neglected to point out thus far that there has been many times over the years that my miserable little starts of Hoya yuennanensis put out peduncles, but they never produced any buds. In the spring of this year (2023) I started the plant over for at least the tenth time since I got it way back in 2016. I started a few pots of it, and took one cutting of it and started it with Hoya aff. thomsonii. In the summer, I decided to put it outside in the greenhouse for the heck of it as I could not remember if I had grown it that way before or not. In late July, I almost fell on the ground when I went to water it, and saw that an old peduncle had actually started to bud up!

Finally on my 35th wedding anniversary, the buds opened! Maybe it was saving all of its blooming splendor for a gift, but whatever made it flower, I will never know for sure. As beautiful as the flowers are, the fragrance is even nicer! The smell perfumes an entire greenhouse and is among the most powerful that I have experienced since I have been keeping Hoyas.

Here are the specifications of the conditions that made Hoya yuennanensis flower for me. Potting substrate was coconut husk mixed with 20% large sponge rock (Perlite). Went outside in June to increasing day length hours, and flowered as the day length shortened in late August. Temperature ranged from day time highs of up to 85 F to night time lows down to around 50 F. Watered with nutrient solution once per week.