Edible Uses:
The leaves of spearmint are edible raw or cooked. Having a strong spearmint flavor, they are used as a flavoring in salads or cooked foods. Spearmint leaves can be used whole, chopped, dried and ground, frozen, preserved in salt, sugar, sugar syrup, alcohol, oil, or dried. The leaves lose their aromatic appeal after the plant flowers. They are best dried by cutting just before, or right as the flowers open, about 1/2 to 3/4ths the way down the sock (leaving smaller shoots room to grow). There is some dispute as to what drying method works best, some prefer different materials (such as plastic or cloth) and different lighting conditions (such as darkness or sunlight). The leaves are often used in 'mint sauce', which is used as a flavoring in meals. A herb tea is made from the fresh or dried leaves. It has a very pleasant and refreshing taste of spearmint, leaving the mouth and digestive system feeling clean. An essential oil from the leaves and flowers is used as a flavoring in sweets, ice cream, drinks etc. It has a spearmint flavor.

Medicinal Uses:
Spearmint is a commonly used domestic herbal remedy. A tea made from the leaves has traditionally been used in the treatment of fevers, headaches, digestive disorders and various minor ailments. The herb is antispasmodic, urine-inducing, restorative, stimulant, and has agents that prevent vomiting, that relieve and remove gas from the digestive system, and give tone and strength to the stomach.
Spearmint also stops gonorrhoea, fluor albus and immoderate flow of the period. A cataplasm of the green leaves applied to the stomach, is said to prevent vomiting, and to women's breasts prevents hardness and curdling of milk. The plant is gathered in late summer just as it begins to flower. It yields an oil similar to Peppermint oil and with similar properties. Two or three drops of oil can be taken on a lump of sugar for flatulence. Adding eight drops of the oil to 1 pt (568 ml) of water makes Aqua menthae, or Mint Water, which can be given to babies with colic. The infusion of 1 oz (28 g) of dried herb to 1 pt (568 ml) of boiling water is also said to be excellent for nausea and wind.

Other Uses:
An essential oil is obtained from the whole plant. The oil is used commercially as a flavoring for toothpaste and confectionery, and is sometimes added to shampoos and soaps. The plant repels insects and was formerly used as an strewing herb. Rats and mice intensely dislike the smell of mint.