I received Hoya sp. 22 Khao Yai in the summer of 2012 and flowered it almost exactly three years later. It is a large leafed species that hails from Khao Yai National Forest in Thailand. The leaves range in size from 4 to 6 inches long and from 2 ½ inches to 4 inches in width. In medium to high light the leaves get attractive red blotching. The flowers are a little over a centimeter in diameter before they reflex and are highly perfumed. They are bone colored with caramelized tips.
To bloom this species was not easy, and I suspect that it is not easily flowered as the only photos I have found of the flowers online come from myself as of May of 2015. I needed to let the plant run wild and freely climb without restraints to approximately six feet (two meters) in height. I used a combination of light spectrums including LED, HPS, and T-5 Fluorescent. I watered and fertilized normally. This is a great Hoya for both the beginner and the advanced hobbyist. For the beginner it is easy to grow and will be a challenge for the expert to bring into flower. This plant pretty much has something to offer to everyone!