Hops are the female flowers of a climbing plant found throughout Europe and North America that is related to Cannabis, or hemp.
The most widespread use of hops is in beer production, a practice that dates back many centuries. Whole hops are used by home brewers today for the same purpose, or to make tisanes and teas.
Hops are also added to herb pillows, often in combination with lavender, valarian, mugwort and other herbs reputed to promote relaxation.