Answer:
You went into the woods and got me. You sat down to seek me. You brought me home with yourself because you couldn't find me. What am I?
I am like thunder in your cranium
I run smoother than any rhyme I love to fall but cannot climb.
I keep things green and keep kids happy during summer time.
What is eaten but can also eat?
No matter how little or how much you use me, you change me every month.