the root stock will grow tru to the root stock
and the grafted scion will have the genetic
material of the plant it came from..so the
"top" branches--if the cuttings are taken
from branches that display the characterustics of the grafted plant.


All varieties of willow contain indolebutyric acid which is the active ingredient needed in a rooting hormone.

http://www.garden-helper.com/Articles/Make-Your-Own-Rooting-Hormone.asp

tig is in u.k.