Answer: This plant is usually grafted so I suspect something has happened to cause the root stock to grow and the top weeping portion to die out. This could be cold damage to the graft, for example, or damage to the trunk that would limit the circulation to the top of the tree. You would need to trim off any dead wood (dry, brittle, no green inside the bark) as it will not regrow. If there is growth from the root stock beginning either below ground or low on the trunk (anywhere below the graft) you need to remove that as soon as it appears. If you do not, this type of growth will rob the remaining desirable branches of nutrients and moisture and will soon overtake it. I'm sorry about your tree.
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