Where can I find out what types of understock are compatible with which scion wood? What understock do you use if you want to graft a Hydrangea paniculata on a standard? What about Syringa meyeri on a standard? These are just a few of the many examples I am looking for answers to. I have heard of some strange combinations that I would never think of, like grafting Chamaecyparis pisifera on Thuja occidentalis. Is there an "understock" book that tells all of this info? Many thanks! Travis
There are eighteen pages of understock / graft compatibilities in "Practical Woody Plant Propagation for Nursery Growers" by Bruce Macdonald (former director of UBC BG), accompanied by a further page and a bit of references.