Catmint too. But you'll most likely need to protect your small plants initially or your cat and other cats will demolish them.

Even after they're well-grown, you may end up needing to provide some protection. I have catnip growing in several locations, and earlier in the spring, my cats pulled up new sprouts (soft moist ground -- roots pulled up easily) and destroyed a few plants. In the years past, my cats and other cats have ROLLED in the clump of mature catnip with similar results.
