I always thought air layering has potential with growing cannabis. The fact that you can have one large mother plant, or many, with a bunch of branches air layering taller clones is interesting. It would be beneficial to those who have plant count limits and want to abide by them, effective air layering could speed up the turn around time between crops. The day the flowering clones are harvested the air layers could be removed and take their place. You could have a bunch of 1'+ tall clones that only need a week or two of veg (possibly less) before they go into the flowering phase. I have never successfully completed an air layer clone, but I have only tried it three times over the years.