Al:
I am not sure that there isn't any secret to my air layering, in fact I just use regular loose Bonsai soil.I did place a piece of copper wire above the top cut and I made sure I had a good clean cut on the bark, where I wanted the roots to grow.
I've included a picture showing the roots before separateing the air layer. Compare this picture with the ones above.
Although, I used a plastic Colander, which I believe allows oxygen to enter through the sides of the pot/colander. Other than that, maybe just a bit of luck!
