Peppermint is an herbaceous creeping perennial with strongly aromatic foliage. It spreads with virtually unstoppable fleshy white rhizomes. The leaves are opposite, toothed, 1.5-3.5 in (4-9 cm) long, and when bruised smell like menthol. The flowers are tiny purple-pink tubes borne in upright terminal spikes. Although peppermint may cover a large area on the ground, it holds its stems and leaves no more than a foot (30 cm) aloft. There are varieties of peppermint that smell like lemon, varieties that smell like lime, varieties with crinkled leaves, varieties with variegated leaves, and one with red stems. Several commercial varieties have been developed for different mint growing regions of the world.
1066 Mentha X piperita - Floridata, http://www.floridata.com/Plants/Lamiaceae/Mentha%20X%20piperita/1066 (accessed January 23, 2017).