There are lots of trees that won't grow from cuttings, which is one reason all that grafting goes on. Even grafting doesn't work in all species. A professional nurseryman showed me a beautiful tiny dwarfed eucalyptus that he had accidentally created. It was probably a triploid cross and therefore wouldn't set useful seed. When I last spoke to him, he had been trying for 4 years to find a way of propagating it, including employing labs to try all the latest techniques, with no success at all.