3

Your picture shows that new growth has almost enclosed the old bole. As time goes on, the gap will close and new wood will be added each year all around the trunk. Structurally the tree will be okay for at least a decade or two or more. Along this 'seam' and its edges, however, it is (almost) certain that branches will never develop. In other words, that one ...


2

You don't say where you are in the world, but the best time to prune Gleditsia triancanthos is actually autumn/fall - cutting live wood in spring is likely to mean bleeding of sap from the cuts. However, if all you're having done is the dead wood removed, that might not be such a problem. I can't find anything that suggests these trees are any more prone ...


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