Peppermint is a perennial herb that is a natural hybrid of water mint and spearmint. The United States is the leading producer of peppermint. We source our peppermint exclusively from top-quality Northwest-grown mint, which is considered some of the world's finest. Stash Tea purchases its mint leaf directly from the farmers. It is sent from the peppermint fields to the Stash Tea production facility, where it is blended and packaged.