Air layering

I'm going to try this technique on a brugmansia I desire for my garden. It requires an understanding of cambium, phloem and xylem. I have the sphagnum and I'm ready to girdle.

"In the process of airlayering, the bark, the cambium, and the phloem layer are removed by cutting away about a 1 inch wide ring of these tissues from around the circumference of the shoot. The xylem however is left intact. This is known as girdling. Generally, synthetic auxins (in a vehicle of talc powder or by liquid) are applied to the site where the tissues have been removed. (Although applying auxin is the general practice today it is not necessary for many trees). Wet sphagnum moss (or another moisture retentive soil) is then bunched around and over this girdled site and covered with plastic and sealed."

The bloke in the picture recommends the use of kelp powder as a stimulant for root-formation. I'll try that. I see he used tinfoil.