Lavender
Lavender is sometimes put in medicine, and sometimes to prevent infection. Lavender oil was used in World War I to disinfect walls and floors of a hospital. As the folk wisdom says, lavender oil is also helpful to headaches when rubbed on your temple, and lavender tea helps you relax before bed time. Lavender is also helpful when applied to insect bites. There is a general lack of real knowledge about its effects.