@edgarblythe,
I brought the catnip inside and tried to keep it going - I like it fresh in tea. But it didn't want to keep going (I've had a bigger one last through winter outdoors here, but this plant was a junior sort). Facing the fact of imminent catmint loss, I tried drying it, as I do with rosemary, lavender, bla blah, and it was just too damned twiddly to deal with. I did succeed with drying apple mint last year...
Back in CA, I grew several kinds of thyme, camomile, fennel, basils, parsleys, dill, and stuff I'm not remembering. I'll have to read up on what can make it inside at x temp.