Question: how to do air layering?
Answer: Choose a one- to two-year-old stem that is straight, healthy and vigorous. ... 
Wound the stem, making a 2.5cm (1in) cut through a leaf bud, angled towards the shoot tip. ... 
Apply hormone rooting compound to the surface of the wound.
Pack a small amount of moist sphagnum moss under the tongue of the wound.