Various other strains and hybrids from the same parents have been bred, but contribute little to world production. Spearmint is derived from a range of species, but the two most important sources worldwide are M. spicata and M. x gracilis . The essential oil of the two differs somewhat in chemical composition. Mentha x gracilis is a hybrid derived from M. arvensis and M. spicata , and has broader leaves and a reddish tinge compared with M. spicata . Mentha x smithiana has a mixed parentage of M. aquatica , M. arvensis and M. spicata , and has a sweet aroma very similar to spearmint.
All mints spread by stolons and can become weedy in home gardens.
An attractive variety of spearmint with curled leaves, M. spicata var. Uses Dried peppermint leaf is used in herb teas, either on its own or in mixtures. Peppermint tea is regarded as a stimulant, a cure for flatulence and has antiseptic properties. It is used in treating indigestion, sore throats, colds and toothache, among others. Peppermint, and other herbal teas are being consumed in increasing quantities by the general population purely for enjoyment rather than for their medicinal activity.