In the dim light of the stars their stems were grey, and their quivering leaves a hint of fallow gold.
Looking through an opening on the south side of the flet Frodo saw all the valley of the Silverlode lying like a sea of fallow gold tossing gently in the breeze.
It was hard to say of what colour they were: grey with the hue of twilight under the trees they seemed to be; and yet if they were moved, or set in another light, they were green as shadowed leaves, or brown as fallow fields by night, dusk-silver as water under the stars.
There are no more uses of "fallow" in the book.
Show samples from other sources
At some point she pulled over abruptly on Fallow Ridge Road and cut the headlights, waiting until another car began to squeeze its way toward us on the single-lane road.
Lauren Oliver -- Before I Fall
A thuwhump! when it broke the sound barrier, an ear-piercing shriek as it rocketed to earth, the ground shuddering under our feet when it plowed into a fallow cornfield.