Sentence:  Next to Leo Durocher , Dark taught Mays the most when he was a <WSD>grass</WSD> green rookie rushed up to the Polo Grounds 10 years ago this month , to help the Giants win a dramatic pennant . 
Meaning of the word marked with <WSD> tags:  narrow-leaved green herbage: grown as lawns; used as pasture for grazing animals; cut and dried as hay