I know very little about dogwood propagation but I do know that each species is not always propagated the same. The cuttings are different too in different species. There are almost as many ways to propagate dogwood as there are different dogwoods.This is what I do know about flowering dogwood... June and July softwood cuttings 5 or 6 inches long; Tip (terminal) cuttings are the easiest to grow, and they produce a straight trunk tree, hardwood cuttings are the more difficult........that is not very much but it is all I can remember....would you possibly be able to get your hands on a book called "The reference Manual of Woody Plant Propagation" by Michael A. Dirr and Charles W. Heuser, Jr. We used this as our bible for many years and it is so worth it if you can find a copy. I realize in your case it is a once and done thing but maybe your library has a copy, or you can find a nursery that has one you can use to make a copy of whatever species you are trying to grow again. My first thought is why not just leave it grow where it is and see what happens? It just may come back even better if it is not that old a tree. Six feet should still be a pretty young tree. I wish I could help you more.
