Answer: There are many possible reasons for dieback, ranging from pest and disease to drought to poor site selection or improper planting or care. If you have significant problems and this is a new plant, I would suggest you work with the retailer where you purchased the plant to diagnose the problem. If you have an established plant, your local professionally trained nurseryman and/or county extension should be able to help you trouble shoot. I'm sorry I can't be more specific for you.
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