If your having trouble getting cuttings to root in a soil/medium. Try it this way. Those styrofoam container that you get food in. That have a lid attached. That close. Take your cuttings set them in water for an hour or so. After removing all leaves, cut at 45° and scrap off the outside stem coating down to the cambrian layer.. Put them in a cup of the water for an hour or so. Tap the excess water off. Then dip them into your rooting powder, tap the excess powder off. Then put them in the tray close the lid. Put in your cupboard. A dark place. Then mist with water every 3-4 days. Check for blackening on the ends. If they blacken toss them. But once you get some that start to callus on the end. Take them out dip them in water again, and then back into your powder. Then plant them into a soil/medium. I have had excellent results rooting like that over putting them straight into a soil/medium first. Once they're callused your almost there. It gives them a headstart to produce roots being callused before planting. Instead of straight into soil. I think sometimes the soil gets to wet and holds too much moisture to root hard to root cuttings. The stryofiam trays dont seal completely letting humidity in. Keeping them lightly moist from drying out. But you have to mist them every few days.