From WordNet (r) 2.0 (August 2003) [wn]:
grassy
adj : abounding in grass [ant: grassless]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Grassy \Grass"y\a.
1. Covered with grass; abounding with grass; as, a grassy
lawn. --Spenser.
[1913 Webster]
2. Resembling grass; green.
[1913 Webster]