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If a birdhouse is hung on a tree branch, it won’t move up the tree as the tree grows
This is because trees grow from the top. Specialized cells in the ends of the tree shoots form areas called meristems. These meristems are the locations from which a tree grows taller and limbs grow longer. Because trees grow from their most distal ends, it means that a branch will always be the same height as it was the day it emerged from the trunk as a little bud. However, just because tree branches do not rise as a tree grows doesn’t mean they will always be there, many trees shed their lowest branches as they grow.
