Study says giant trees have 'no trouble' pumping water up 70 metres. A commenter notes they aren't pumping at all (news.exeter.ac.uk)
Exeter and Cardiff researchers, studying trees 7–71 m tall in Malaysian Borneo, found the tallest showed no height-related growth loss even through the 2023–24 El Niño drought. The mechanism: low-pressure suction through vessels that widen toward the ground, plus leaves adapted to greater water stress.
The thread's caveats: the study only reached ~80 m while no tree exceeds ~130 m for exactly this hydraulic limit, some giants drink from fog, and 'pumping' is a misnomer for passive transpiration tension.
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