Nicotiana tabacum is a sticky, thick-leaved perennial that can reach up to six feet in height. Hardy to Zone 8, this is the preferred species of the tobacco industry. Its sweet-scented, highly ornamental flowers are white to pink and are pollinated by bees and butterflies. Tobacco juice may used as a pesticide, although nicotiana rustica, which is the highest in nicotine, is normally preferred for that purpose. Despite its recreational popularity, tobacco was traditionally considered a medicine. For medicinal purposes, though, it was often used externally and absorbed through the skin. For example, it was applied to the skin to relive pain, such as would accompany insect bites and stings. OS400 is a one sucker variety of tobacco, meaning that it only has a single flowering stalk. This means more energy is put into leaf growth resulting in long, narrow leaves with a high yield and good disease resistance.