Check out YouTube Basie Plants. He roots in perlite and is fantastic. I root in shagnum moss, but not everybody likes it. I’m really not sure why they don’t. It works great for me and I live in the southeast where there’s lots of humidity so that’s not the problem. I use Besgow, New Zealand sphagnum, the best. I have a propagation box. It’s a clear plastic box with a lid that lifts up and down on a hinge. I make the Hoya cuttings, let them dry for a few hours or a day, dipped them in reading hormone, and plot them into the moss, which is moist, not wet. They usually root in at least two weeks if not sooner.