Answer: Based on your description it sounds as though the tree is stressed. Perhaps it is planted too deeply (you should be able to see the trunk flare above the soil) or there are encircling roots below ground that were not cut or unwound at planting time and so are continuing to grow in a circle and stunt the tree, or there is some other root-related problem such as a large rock just beneath the planting hole preventing it from rooting and becoming established or if you are using a watering system perhaps it is receiving less water than the other trees.... I would suggest you work with the retailer and/or your county extension to try to diagnose the problem more specifically. I'm sorry your tree is not doing well.
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