The Life of Trees
To its lumber party. Like a family tree, the phrase "when one tree has a birthday" is figurative language and doesn't depict an actual event in the life of a tree. Trees, being living organisms, do not have birthdays in the way humans do. Humans and certain other animals have birthdays that commemorate the anniversary of their birth.
We may claim that trees stay rooted in the same place throughout their lives if we interpret the expression metaphorically and picture trees celebrating their presence. When someone has a "birthday," they don't actually transfer from one place to another. Instead, they carry on expanding, evolving, and thriving in their surroundings, offering cover, creating oxygen, and enhancing the ecology in which they are planted.
Where do trees go when one tree has a birthday?
Trees do not go anywhere when one tree has a birthday. The phrase "to its lumber party" is used figuratively, and trees do not actually have birthdays like humans do. Trees continue to grow and thrive in their environment, providing essential benefits to the ecosystem where they are planted.