Why don't trees grow to 1,000 feet tall? Here's what limits them:
"The Douglas-fir, state tree of Oregon, towering king of old-growth forests and one of the tallest tree species on Earth, finally stops growing taller because it just can't pull water any higher, a new study concludes."
http://www.sciencedaily.com/releases/2008/08/080811195319.htm
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