My indoor rubber plant (Ficus elastica) has gotten 'leggy', having lost most of the leaves halfway down its 5-ft stem. I am considering air-layering the plant. Can I air-layer my rubber plant without using a rooting hormone (I haven't had much luck with rooting hormone powders in the past)? By scratching rooting hormone powder, do I significantly reduce the probability of successful propagation? My ficus has numerous small nodules on its stems, which I assume have the ability to develop into aerial roots - could I just wrap the damp sphagnum moss around an area of stem containing a bunch of these nodules and wait for roots to develop? Has anyone had success using a similar method? Any tips on air-layering will be appreciated! Thanks!