Hops are the female flower cones of the hop plant (Humulus lupulus). They are used primarily as a flavoring and stability agent in beer, and also in other beverages and in herbal medicine. The first documented use in beer is from the eleventh century. Hops contain several characteristics favorable to beer, balancing the sweetness of the malt with bitterness, contributing flowery, citrus, fruity or herbal aromas, and having an antibiotic effect that favors the activity of brewer's yeast over less desirable microorganisms. The hop plant is a vigorous climbing herbaceous perennial, usually grown up strings in a field called a hopfield, hop garden or hop yard. Many different varieties of hops are grown by farmers all around the world, with different types being used for particular styles of beer.

History

The first recorded reference to hops was by Pliny the Elder in his Naturalis Historia. The first documented instance of hop cultivation was in 736, in the Hallertau region of present-day Germany, although the first mention of the use of hops in brewing in that country was 1079. Not until the thirteenth century in Germany did hops begin to start threatening the use of gruit for flavoring. In Britain, hopped beer was first imported from Holland around 1400; however, hops were initially condemned in 1519 as a "wicked and pernicious weed". In 1471, Norwich, England banned the plant from the use in the brewing of beer, and it wasn't until 1524 that hops were first grown in southeast England. It was a further century before hop cultivation began in the present-day United States in 1629.

World production

Important production centers are the Hallertau Valley in Germany (which, in 2006, had more hop-growing area than any other country in the world), and the Yakima (Washington) and Willamette (Oregon) valleys in the United States. The principal production centres in the UK are in Kent (which produces Kent Golding hops) and Worcestershire. Essentially all of the harvested hops are used in beer making.

Global prices for hops (along with barley and malt) are currently on the rise due to a combination of prolonged drought conditions in Australia, North America and New Zealand, a poor harvest in Europe, increasing fuel prices and the rising demand for corn ethanol in the United States.

This increase will likely see an increase in the price of beer.

Until mechanisation, the need for massed labor at harvest time meant hop-growing had a big social impact. For example, many of those hop picking in Kent, a hop region first mechanised in the 1960s, were Eastenders. For them, the annual migration meant not just money in the family pocket but a welcome break from the grime and smoke of London. Whole families would come down on special trains and live in hoppers' huts and gradients for most of September, even the smallest children helping in the fields.