Hi,
some trees respond well to air layering, readily shooting out
new roots on all sides (willows, acers,...), others tend to make
just one root (cedars), and still other hardly ever respond (pines), so . . .
first question would be: what trees are we talking about here ?
(BTW: scorching & torching is definetely NOT a good idea
for airlayering in my book !)
Greetz,
Michel