Hoya australis ssp. Oramicola Is Xerophytic??

According to Ted Green’s website, Hoya australis ssp. Oramicola is xerophytic, meaning a plant adapted to an arid environment, and should be grown dry in the winter time. This is probably good advice as it grows on dunes and red laterite in it native environment where it is subject to a monsoon rainy season followed by a long dry season. I have probably truly messed my plant up as it has been highly watered in a completely artificial environment since I received it!