I have never tried the "sphag and bag" for propagation. However, today I broke off an old leafless cane of my Dendrobium limpidum to give this a try. The cane I removed is still plump and green but entirely leafless. I have placed it on some moist sphagnum moss inside a sealed plastic bag. I don't know whether to give it light and warmth or dark and cool, etc? I currently have it nestled into the sphag with the upper surface exposed. Should it be completely covered? I don't know if this will work but thought it was worth a try. Any suggestions or thoughts?