The cambium layer must be able to move water laterally as well as
vertically.


The cambium itself does nothing but divide; it gives rise to phloem
on one side, and xylem on the other.

But yeah, city trees have it tough, with pavement typically covering
up half of their root systems. The roots that can get water supply
the whole tree, but since lateral flow is much slower, the dry side
gets stressed. Sometimes you can drive down a city street in
september and see trees that are half-red (on the street side) and
half-green (on the sidewalk side).

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