At the Westchester cat show this weekend there was this vendor of enormous cat trees who had the best catnip. I'd gotten one sack last year and it lasted about a week. It's called Dr. Pussum's Best, pure 'nip sewn into about a 3 inch square bag. This year I got 5 bags and am doling it out. This stuff comes from Vermont. Diamond is the worst nip head of the bunch.