Answer: If the tree never leafed out (as opposed to leafing out and having the leaves eaten by caterpillars) my only guess is winter damage. I don't think your weather got cold enough to kill the leaf buds, but there's always that possibility. Look closely at the branches to see if you can tell whether or not leaf buds tried to develop. If not, I'd suspect a root problem. Water stress can kill a tree, as can applications of weed and feed or broadleaf weed killer (2,4-D) below the canopy of the tree. I can't think of anything else to suggest other than to be patient and see if your tree has enough energy to develop leaves later this month. I hope it does!
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