Old growth giants limited by water-pulling ability

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.

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<p><a href="http://www.physorg.com/news137692385.html">Old growth giants limited by water-pulling ability</a></p> <p>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.</p>