Mint grow well in France and is usually easy to find, unless you want dried mint. Much is spearmint, the common garden mint; you can also commonly find menthe poivrée peppermint and sometimes menthe aquatique (also known as baume d'eau, baume de rivière, bonhomme de rivière, menthe rouge, menthe à grenouille or riolet) which is mostly used in essential oil.
Mint tea is a classic herbal tea; crème de menthe is a powerfully minty liqueur, most famously Get.
Image by Anna