I'd recommend taking it out immediately and restaking it with a 5- 6 foot bamboo stake. I like to train my trees to go upward. The tree will need to stay staked until planted in the ground. With Maples the trunk will get thicker when planted into the ground. You should be able to take the bamboo stake away in one to two years. Pacific Coast Maples and Sooner Plant Farm have great informational websites pertaining to proper care of maples. Their websites are http://www.pacificcoastmaples.com and www.soonerplantfarm.com respectively.
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