I had good success ( the first time I tried ) in winter rooting an assortment of Hoyas.
I used a peat based potting soil from Sunshine and of course kept it constantly damp.
I used shallow pots for Hoya cuttings and placed them on trays. The trays were set on my gas range where the pilots provided constant warmth.
The only time they had lighting was when I was home in the morning or evening, I would turn the halogen bulbs on the range hood.
In my opinion, moisture and warmth are the two primary needs to root Hoya cuttings.
Good luck, Kristi
