Elvis is like this with silvervine. I have a small container of it in one of their sideboards *"Their" sideboards because both sideboards are for cat food, treats, supplies and whatnot* and if I open the doors on that one, he'll paw it out and go CRAZY. It's in a hard plastic container with a lid, inside a sealed plastic bag.Casper has his own, large bowl to keep his toys in.
He knows where it is and, whenever he decides that he wants to play with a new toy, he goes to his bowl and picks one out.
There's also a small bowl of catnip next to his toy bowl. Any time he wants some, he'll go there and have a nibble.
I've never seen a cat, before, that actually eats catnip by the mouthful! He's the biggest catnip fiend I have ever seen!
Whenever we get out the jar of fresh catnip out of the cupboard (we have to keep it locked up or else he'll get into it) he's right there, no matter where, in the house, he is. He could be in a dead sleep but will come a'runnin' when he hears the catnip cupboard open!
If we ever let him outside, he'd be that cat standing on the street corner, saying, "PSST! Hey! Wanna' buy some catnip?" whenever another cat walked by!
We're happy to give Casper almost as much catnip as he wants but, left to his own devices, would probably have his pockets stuffed with it.