Peppermint is a refreshing herb that is perfect for a courtyard herb garden. It has a cooling effect and can be used to make herbal teas that aid digestion and relieve nausea. Peppermint leaves can also be used to make homemade toothpaste or added to bathwater for a soothing and invigorating experience. Additionally, peppermint oil can be used topically to relieve headaches and muscle pain.