Answer: Your tree most likely not die but it may be mis-shapen depending on how/where it was cut. There will be new growth this summer. Do not fertilize it this year as that will encourage excessive sprouting. Watch it carefully and remove any suckers from up from the roots or from lower on the trunk right away. Sadly, you may be better off replacing it in terms of having an attractively shaped mature tree. Ornamental crabapples should not be severely pruned, and they are not pruned the way bearing apples are pruned, either. Instead, pruning should be limited to removal of dead, diseased or badly damaged branches and removing any suckers from below the graft with possibly a bit of thinning later on if the tree becomes overly dense.
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