How tall can a tree grow?

In my fantasy world I want fantastically large trees, particularly in the height category. The tallest trees on earth grow just over 100 meters tall. Why can't they get taller? What circumstances would allow a tree to grow taller?

Currently I'm growing my trees in micro-gravity, in a sterile environment with no diseases to kill the trees, and with little to no wind to knock them over. How tall could my trees get? What else do I need to take into account if I want my trees to grow to several kilometers in height?

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How tall can a tree grow?

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