A few years ago, we planted peppermint in our veggie garden, not realizing it was extremely invasive. Right now it is in the weedy area that I haven't sheet mulched yet. It covers an area about 10 feet in diameter, and it is just now getting into the lettuce bed! My plan for this fall was to chop and
compost it, then sheet mulch with cardboard/manure/straw/compost, and maybe plant a cover crop to outcompete any stragglers.
On the other hand, the bed of mint looks lovely, smells great, and my daughter loves it. Do most folks grow mint in containers only? Is there a way to have a patch of mint that doesn't spread?? Ok, maybe it involves concrete walls or something...