Yes, you can propagate store-bought mint. A lot of the same principles apply. Mint plants you buy from the produce section of your local grocery store are usually sold as cuttings or sprigs. This makes the process of propagating store-bought mint as seamless as doing it on your own. It’s recommended that you transplant them as soon as you get them home from the supermarket so that it has a chance to grow and get used to the change in environment. Grocery store mint isn’t taken care of with the same attention to detail that you would expect from a nursery. Grocery store plants are sold with the expectation that they won’t last long. While it’s certainly possible to propagate a store-bought mint plant, you do have to be careful. The change from sitting in a grocery store with fluorescent lighting to natural sunlight can take a lot out of the mint plant. This is why it’s recommended that, if you plan on propagating the store-bought mint, you do it as soon as you get home from the grocery store to make it easier for the plant to adapt and grow.