Answer:
I fly, yet I have no wings. I cry, yet I have no eyes. Darkness follows me. Lower light I never see.
What has a mouth but can't chew?
You can only have it once you have given it.
Grows from the ground, bushes and grass, leaves of yellow, red and brow, unruly plants, get the axe, trim the hedge back down.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.