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Can I plant a tree and then build a treehouse in it?

It takes several years for roots to establish themselves well enough to support a treehouse. The actual time varies according to the following:

I think you can see that it's impossible to give a specific answer. But to put a number on it, I would say 3 years at minimum. To assess a specific tree and situation, you should contact an arborist to transplant the tree for you and tell you when it has reached suitable stability and mostly recovered from transplant shock.

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