From Shansi's mom...
Our Guy is strictly an indoor cat. In our screened in patio/pool area we have a big plastic tub planted with home-grown Catnip~he loves to nuzzle in it but doesn't eat the leaves. We also keep a tub filled with real grass that he loves to both lie on and chew on the blades to clear out his hairballs. He's pretty spoiled and plenty loved!