Answer:
I am flora, not fauna. I am foliage, not trees. I am shrubbery, not grass. What am I?
My first is in riddle but not in little. My second is in think but not in brink. My third is in thyme but not in time. My fourth is in mother but not in brother. My last is in time but no t in climb.
I grow up while growing down
A hole in a pole. Though I fill a hole in white I'm used more by the day and less by the night
I am owned by Old McDonald.
No matter how little or how much you use me, you change me every month.