Answer:
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
I am mother and father, but never birth or nurse. I'm rarely still, but I never wander.
If a man carried my burden, he would break his back. I am not rich, but leave silver in my track.
Pregnant every time you see her, yet she never will give birth.
He stands beside the road. In a purple cap at tattered green cloak. Those who touch him, curse him.
I break away from my pack. I create holes in my victims. I can travel for miles and then disappear. I am part of a dying breed. What am I?