Hēo wiexþ ymbe 90 cm on hīehþe, although it may reach heights of 150 cm when supported by taller vegetation and has a distinctly minty smell. It has ovate to ovate-lanceolate, green (sometimes purplish), opposite, toothed, veined leaves which can be either hairy or hairless. Þā stefnas sind oft purpurene. Flowers are tiny, densely crowded, purple, tubular, pinkish to lilac in colour and bloom from July to September. Water mint is pollinated by insects, but can easily be propagated through root cuttings, like other species of mint.