Just removed an air-layer, I have had on a massive old magnolia for 3 months. The trees branches span about 13m and has several trunks about 30cm width. This was one of the upmost branches, about 10m up. The layering was standard, except I wrapped it in a plastic bag with an opening on the underside of the branch, as to collect all rain water into the bag which kept the air-layer moist for me. I often noticed, the bag containing over a litre of water after rain.
I also added water crystals to the soil / spagnum mix.
The branch is over 1.8m tall and has a width at base of only 6cm.


It was most probably more an experiment, than an attempt at collecting good bonsai stock.
Not sure where it could go, possible chop it right down to about 90cm high. I don't think it will ever make good bonsai, but I was impressed at the scale of the layer.
Any thoughts?