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Just tying a string to a tree would not be a valid eruv. One needs to have a "Tzruat Petach" which means that it needs to appear similar to a doorway with a "lechi" which is the doorpost and the "mashkof" which in this case would be the string.
So one needs to affix to the tree a post, such as a piece of wood. One would then attach the string directly above this post.

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15y ago

What else can I help you with?