Peppermint plant grows 1- 3 feet, plant grows best in dark, moist soil, related to spearmint.

Flowers are small and pale purple, born on leafless terminal spikes in loose disconnected whorls.

The principal constituent of peppermint oil is Menthol (C10 H19 OH) which is white crystalline substance, has the peppermint odor and produces a sensation of cold in the mouth.