Answer:
I drive men mad for love of me, easily beaten, never free. What am I?
I am flora not fauna. I am foliage not trees. I am shrubbery not grass.
I walk on 4 legs in the morning 2 legs at noon and 3 legs at night.
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?
Travel a mile and I will change, travel a million and I will end as I started. What am I?
No matter how little or how much you use me, you change me every month.