I saw a few posts here talking about this years ago but no one seemed to know. I have 2 hoya princesses that were bought separately from different greenhouses. One of them produces all variegated leaves no matter the light intensity and one that produces some green leaves with splash occasionally. It must be the DNA of the plant because I have pushed the one to the brink even burning it giving it so much light in attempt to see if it puts out only variegated leaves. I did acclimate it slowly trying not to burn it. It did slightly burn but it will be fine in case your worried. Why???? Is it a condition thing or something else? Anyone know? TIA!