A very desirable characteristic of a good many hoyas is how their foliage changes colors in various light situations. As a rule, the leaves of a hoya plant is green but in many cases that will change slightly when the leaves are exposed to bright light. I see most of the drastic reddening of leaves during the winter months as opposed to the summer months when the sun is brightest. This fact in itself is confusing to me. The sun is hottest and brightest during the summer months here in Florida. But, what is the exact reasoning behind what causes the leaves to turn a blush to even a total burgundy color. The species that come to mind include Hoya obscura, Hoya sipitangensis, Hoya flavida and Hoya sp. Gunung Gading. There are many more but these are a great start to the long list of red leaves on Hoyas.
Here is the exact plant, Hoya sp. Gunung Gading last summer and today after if had been under a metal halide light for the past 5 months. My next question is…will the leaves return to green while they are growing under the Florida sun for the next 5 months? Only time will tell and I will report back in the fall or when I notice a significant change.