I grew this Hoya in my regular humid grow tent with constant day length of 14 hours, but knew that it was unlikely to ever flower that way. The regular serpens only flowers when the day length increases in the spring. I did not worry about that because I was primarily interested in getting the plant to a large enough size to want to flower. It was a very good grower and put on many peduncles, and went through a series of up-pottings.