The phrase "fresh grass" means recently grown or newly cut grass, which has a pleasant smell and is usually green in color.
Sentences with «fresh grass»
Plenty of fresh grass hay is very important in a rabbit's diet, as are fresh greens and vegetables. (thesprucepets.com)
A rabbit's diet should include fresh water, fresh grass hay, a variety of greens and root vegetables, and a small amount of commercial pellets. (smallanimalchanel.com)
The most important part of a rabbit's diet is good quality hay together with fresh grass. (gatehousevets.com)