Answer: Raywood ash trees should be pruned when young to develop a strong central leader and good branch structure. Pruning back will force additional branching, which will help the canopy fill out. It's difficult to describe how to prune without actually seeing your tree, but you can safely remove one-third of the branch length without harming the tree. There are many pruning books available at your local library if you're not sure where or how to cut. Best wishes with your Raywood Ash!
Q&A Library Searching Tips