Thanks for the question. As a general rule, larger trees are less successful when transplanting. A 12 ft tree is quite large. Your tree is alive and will continue to grow. I believe it has dealing with transplant stress. It is putting energy/growth into establishing good roots. Do keep watering it for the first 2 - 3 years, which is very important. A couple of gallons every week that it doesn't get rain or when the soil dries out. The white tube is recommended for winter (Nov. - April) to protect the trunk, but should be removed during the growing season. The research shows that fungal diseases and decay can happen inside the tube.

As far as pruning; I would leave the branches for now and next early spring prune off any that are dead, including the upper portion of the central leader that is dead.

Placing wood chip mulch around the base but not up against the trunk is also recommended. This helps capture water, moderates soil temps, reduces evaporation, and protects against weed whacker or mower damage to the trunk.

Paul -Tree Care Advisor Volunteer