"Eru is bountiful," she said. "Now let your children beware! For there shall walk a power in the forests whose wrath they will arouse at their peril."

- Yavanna Kementári,

From The Silmarillion, Of Aulë and Yavanna, by JRR Tolkien

The age of man is done,
The time of growing has come.
Beware the forests and green places.
Beware the walking trees with faces.
Strength once lost has now been found
By the roots within the ground.

Stones will break and roots will squeeze,
Vines will grow and bend all knees;
Mushrooms hunt and thorns yoke,
Weeds strangle and flowers choke.
The age of skin is done.
The hour of bark has come.

*The second stanza of the poem was found online and I could not track down the original poster; I'm only borrowing it and take no credit for its creation. I did, however, create the first stanza to add to it.