Answer: The ultimate size of a tree or shrub really depends upon growing conditions and the care it receives. In your gardening region Raywood ash typically grows 25-35' tall and wide at maturity when grown in landscape situations. These are fast-growing trees at first and then they settle down and grow more slowly. While pruning isn't necessay because they develop an attractive canopy all on their own, you can certainly prune them back while they are young, which will keep them from growing too large, too fast.
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