I think as long as thier roots get adequate moisture the rest of the plant will be fine. That is as long as its not 0% humidity on the rest of the plant. I bet the humidity in the roots is much higher anyway.
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All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
-J.R.R. Tolkien, LOTR, Fellowship of the Ring
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