Not leaving wire in
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Leaving wire in is not required. In my case, the trees have mostly overgrown the wire so removing it would damage the tree more than leaving it in. As I repotted each tree, I attempted to remove as much wire as I could... without damaging the tree. The point is that leaving wire in does not necessarily help or hinder the tree. The wire was placed on the seedlings when their trunks were perhaps 1/2" thick. By the time the tree trunk is 2" thick, not only will the wire be 3/4" below the surface of the bark, but any signs of scarring should be gone.
If I were developing these trees over a time frame longer than 6 years, I would have rewired them, but this time the wire would have been wound in an opposite direction, so that as it bit into the bark it would cause scarring in different lines / directions than the first time. The 2nd application of wire would be removed before it was totally embedded.
At least... this is my plan