Information Sources? - Grafting & Espalier
I was hoping to start doing some research on grafting and espalier of fruit trees. I really like the idea of the espalier style fruit tree fence, and I want to see what other types are out there, as well as how to do them. Additionally, I have two fully matured trees that do not produce good fruit that I would not mind grafting on. One is an apple, so I would like to do a full season of apples on it. The other is a cherry. I want to turn this in to a plum tree with a nice variety.
What books/internet sites would provide great knowledge on this? For the espalier, I think I need a more how to than anything. The grafting, I have the general idea of how to, but I would like help on placement of them to "top work" the existing trees, along with a description of a lot of the varieties.
As always, any help is appreciated.