i have just recently started a Quaking Aspen bonsai in the form of yamadori, i excevated it from the white mountains in arizona and right now it is in a 20" x 6" x 4" pot and seems to have taken to transplant verry well. the tree seens to have already a good 10-20 years of growth on it. I intend to train the branches and trim the roots for a root over rock effect. Does anybody know how to take cuttings from a QA?