Leo in N E Illinois
The Professor
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I would leave the wire on until you actually notice it biting in. Removing too quickly, the tree won't hold its shape. Mild wire marks will disappear with time. You don't want to waste the effort of wiring by removing the wire too soon. With my Shimpaku types, I often leave wire on 2 years. Though there are individual branches where sometimes wire needs to come off in as little as 9 months because that particular branch grew fast.