There are stories that the moss on trees in temperate rainforests allow the tree to pull water from their branches instead of the ground, increasing their max height.
For a while there were people poaching the moss that facilitated this, which is a problem because it grows only inches per year.
And leaves can absorb moisture from water droplets on their leaves. Like from rain or foggy sea winds. Why go through a transport system when the water is right where it's needed?
God that's sad. We really can't have anything nice.