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Mentha aquatica is a perennial flowering plant in the mint family Lamiaceae. It grows in moist places and is native to much of Europe, northwest Africa and southwest Asia. As the name suggests, water mint occurs in the shallow margins and channels of streams, rivers, pools, dikes, ditches, canals, wet meadows, marshes and fens. If the plant grows in the water itself, it rises above the surface of the water. It generally occurs on mildly acidic to calcareous (it is common on soft limestone) mineral or peaty soils.
Water mint is a herbaceous rhizomatous perennial plant growing to 90 centimeters tall. The stems are square in cross section, green or purple, and variably hairy to almost hairless. The rhizomes are wide-spreading, fleshy, and bear fibrous roots. The leaves are ovate to ovate-lanceolate, 2 to 6 centimeters long and 1 to 4 centimeters broad, green (sometimes purplish), opposite, toothed, and vary from hairy to nearly hairless. The flowers of the watermint are tiny, densely crowded, purple, tubular, pinkish to lilac in color, and form a terminal hemispherical inflorescence; flowering is from mid to late summer.
It can be used to make a herbal tea. The cultivated variety known as Eau de Cologne mint or bergamot mint, is used to produce mentha citrata oil, also known as bergamot oil, used in perfumery.
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