Range: ±6 meters
||Kaare H. Jensen & Maciej A. Zwieniecki, Physical Limits to Leaf Size in Tall Trees, Physical review letters, PRL 110, 018104 (2013) DOI: 10.1103/PhysRevLett.110.018104 p.4 right column top paragraphPubMed ID23383844
||M. V. Thompson, & N. M. Holbrook, Scaling phloem transport: water potential equilibrium and osmoregulatory flow, Plant, Cell & Environment, Volume 26, Issue 9, pages 1561–1577, September 2003 DOI: 10.1046/j.1365-3040.2003.01080.x
||"With estimates of
the driving pressure (?p=1MPa, BNID 108684) and membrane permeability
(Lp=5?10^-14m/s/Pa) derived from the literature
[primary source], [researchers] find that tree height hmax at which the flow
speed umin can no longer be obtained is hmax=104±6m."