Randi, mint won't work!
And with catnip it is different. Some cats like it and some are not interested. I have read in one of the thousands of PT threads that Australian kitties are genetically not prone to catnip.

Filou and Tigris didn't like real life fresh catnip I brought to them from a botanical garden- they prefer valeriane.

BUT- big BUT!!! they went crazy about the crocheted ball from catmandu and from the mousie I bought one time in Vancouver- so I am wondering whether Canadian catnip might be a different species from what they sell here.