Nike the cat, and his catnip

We have a sweet two year old cat named Nike who adores the fresh organic catnip we grow for him. We give him a few sprigs once every couple of weeks as I don't want him to overdo. He rubs himself all over the leaves, arches his back, rubs his face as though he is trying to inhale it and just acts silly. He will walk away for a moment or two and come racing back to the bruised leaves and stems to roll in it some more. My task is to gather up some leaves to dry for the winter to see if he will like them. Its funny, he definitely loves the fresh stuff and will ignore catnip we have purchased in the past so its possible he just wants the freshest possible. Smart kitty, just like us, he knows fresh is best!