Answer: The best time of year to prune Arizona ash shade trees is in the winter. They are dormant and the branching structure can easily be observed. Summer pruning should be done only when branches are broken or there is a safety hazard. Dormant pruning also decreases the risk of injury from torn bark. But, if you're careful to make undercuts so you won't tear the bark, you can prune now. Expect to see new sprouts near the cuts later this summer. Just rub them out when they appear. As the wounds heal you should see no more sprouts from the pruned area.
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