The blooms of Hoya paulshirleyi only last around 2 days and have a slightly sweet smell only in the first few hours after opening. Pollinators must act quickly to get this one to produce seed!
Paul Shirley operates a web-based nursery in the Netherlands called Paul Shirley Succulents. He ships plants all over the world with the exception of the U.S. and Australia. In 1994 Paul joined Ted Green and Dale Kloppenburg on an expedition to Sulawesi, Indonesia and they discovered a number of new Hoya species. Eventually the plant that Paul found and gave the accession number GPS 8845 became Hoya paulshirleyi. Below the foliage of Hoya paulshirleyi:
Hoya paulshirleyi needed to be watered well a couple of times a week and grew quite rapidly. I was quite surprised when I spotted the first peduncle so early. From Cutting to flower only took around six months – Keeping in mind this was grown in ideal conditions of artificial lighting in a grow-tent.
Now that we have touched pot, soil, and watering, it’s time to talk about light and humidity. Hoya curtisii will grow well in full sun or very little sun. It is pretty adaptive. I flowered this plant the first time after having it exposed to full sun out of doors for a full summer. The second and third time it flowered just as the days were beginning to lengthen in late February/Early March indoors in a northwest window with almost no sun.
There is no doubt that Hoya curtisii grows best in high humidity, but it will muddle along with relative humidity as low as 40%, but expect a lot of dried out growing tips. My plant lives year around now in my house witch gets pretty dry in the winter time. I think think this Hoya would like to live in a bathroom where it would get extra humidity from people taking showers.
Now that we have the soil and pot figured out, how about a watering schedule? I have found the schedule should be thrown out; this plant needs to be only watered once it has dried out. I’m a person who likes to water all of my plants on the same day each week, but with Hoya curtisii it won’t work. Water only when dry, then soak the plant, and start the process all over again.
There is much advice on the internet about how to care for Hoya curtisii from never let it dry out to keep it dry all the time. I can only say what has worked for me. The plant needs a relatively small pot where it can literally live for years (Mine has been in the same 4 inch pot for 4 years!). The soil should be relatively free draining, but also have some water holding capacity. Peat-based potting soil amended with 25% perlite should work fine.