I don't know if this is exotic, but I love to grow Catnip. My cat is always seeking it out, and I enjoy cutting some, putting it into Ziploc bags and sharing it with friends who have cats.
I was out preparing a raised-bed today and found catnip growing in it! I didn't put the catnip there, so it must have "travelled" from where I have it planted some thirty feet away. It's a fun crop to grow.
Anything else I can grow that cats love?