Evaporation from redwood leaves at the top of the tree draws water upward through its great length from the roots at an incredible rate. The cohesive properties of sap, which is mostly water, plays a big part in this. Fog in their habitats also provides absorbable water from the air. They are adapted to their climate, with thick bark protecting them from wildfires, and as long as their environment is healthy they can grow to incredible heights–as much as 379 feet.
Whether redwoods get “so much” taller depends on which coast redwoods and how many centuries have passed. The coast redwoods gain great height rather quickly because they have a fast rate of growth. The wood resists decay. And the coastal climates they are indigenous too have fog which helps.
After several centuries have passed, mature coast redwoods may not be much taller than the tallest of other genus and species: maybe 10 to 15 meters more. Presently, there is a Douglas fir approaching 100 meters: an old one. Some Eucalyptus forests have very tall canopies too, and the Eucalyptus can grow as fast or faster sometimes.
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