Clustered mountain mint (Pycnanthemum muticum), I just discovered, is primarily a wetland species, but you would never know it. I have it in the driest part of my garden—it is never watered—and it is doing fine. Likely it would spread more if it got more water, but then maybe dry is a better idea for a mint.
I think the main reason people plant clustered mountain mint (and other mountain mints) is that it is beloved by pollinators, particularly butterflies. But you can use the leaves in tea (though it’s a little weird tasting if you’re thinking spearmint), and there are many reported medicinal uses for it, too.
Clustered mountain mint has been blooming for several weeks now under a clump of pine trees in the back of our yard. It would like more sun, I think, but it seems to manage without flopping. The silvery look of the upper leaves and the bumpy buds with their fringe of flowers is unusual and attractive. Whenever I walk by, I like to grab a handful of the intriguing fragrance. It is a nice herb to have, and it’s native to the eastern United States.