LysmachiaMoon said:My question is: When should I select one of these sprouts to become the main trunk of the new tree?
Do I select the best sprout NOW and prune away the rest? Or should I wait until next spring to see which one(s) have survived the winter?
Agree with waiting till the spring and seeing how it looks then! My gardening friend with the damaged magnolia tree said she did some research on creating a new central leader for her tree, and she ended up using a stake as a splint to force another branch or limb to become the central leader. She used a wooden stake, and then secured the new leader branch with soft garden ties. She has been gradually tightening the ties holding the new leader upright as it begins to grow more upright.
Of course, with the regrowth so new on your dogwoods I agree it makes sense to wait and see.