Answer:
You hear me speak, for I have a hard tongue. But I cannot breathe, for I have not a lung. What am I?
I plow and plow but never sow.
I am a kind of coat that can only be put on when wet.
I am flora not fauna. I am foliage not trees. I am shrubbery not grass.
What can be as big as an elephant but weighs nothing?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.