Mint needs to walk, it uses all its nutrients within 2 years and will pretty much die off. I have had 3 different mints I grow, the mojito mint died off this past summer in the drouth. The peppermint is in a raised bed and allowed to travel til I yank it up. Have even dumped a bag of new dirt on it and it returns from underneath, is at least 7 years old. This last 19* cold spell bit it back to ground level, but it popped back up within 2 weeks, so has the Kentucky Colonel Spearmint, going on 5 years.
