Hops
Flowers of Humulus lupulus used to bitter and preserve beer.
Hops are the flowers—also called seed cones or strobiles—of the climbing plant *Humulus lupulus*, which belongs to the Cannabaceae family. Their main job is to add bitterness, flavor, and stability to beer, bringing notes like floral, fruity, or citrus. They also show up in other drinks and herbal medicine. The plant has separate male and female individuals, and only the females are grown commercially. It’s a vigorous perennial that climbs, usually trained up strings in fields known as hopfields, hop gardens (in southern England), or hop yards (in the West Country and the United States). Farmers around the world grow many different varieties, each suited to particular beer styles.
The earliest known use of hops in beer dates to the 9th century, though Hildegard of Bingen, writing about 300 years later, is often credited as the first documented source. Before hops took over, brewers relied on a mix called gruit—a blend of bitter herbs and flowers like dandelion, burdock root, marigold, horehound (whose old German name, *Berghopfen*, means “mountain hops”), ground ivy, and heather. An early mention of a hop garden appears in the will of Charlemagne’s father, Pepin the Short, from 768. Hops also help in brewing by fighting off unwanted microorganisms, and they balance the sweetness of malt with bitterness and a range of flavors and aromas. It’s thought that traditional herb mixtures were dropped once brewers noticed that hopped beers spoiled less easily.
Early hop cultivation is often traced to the 8th or 9th century in regions like Germany’s Hallertau, though the exact first documented date is debated. In 768, hop gardens were left to the Cloister of Saint-Denis in Pepin the Short’s will. The first mention of hops in German brewing came in 1079. It wasn’t until the 13th century that hops began to challenge gruit for flavoring. Which one brewers used often depended on which the nobility taxed—if hops were taxed, they switched to gruit, and vice versa. In Britain, hopped beer arrived from Holland around 1400, but as late as 1519, hops were condemned as a “wicked and pernicious weed.” In early 16th-century Germany, using hops became a religious and political choice: unlike gruit, hops weren’t taxed by the Catholic Church, so Protestants preferred hopped beer.
England imported hops from France, Holland, and Germany, paying import duty, until the early 16th cent
- field
- Brewing, herbal medicine
- known_for
- Primary bittering and flavouring agent in beer; antibacterial properties
- first_documented_cultivation
- 8th or 9th century, with early references including Pepin the Short's will (768) and later cultivation in the Hallertau region
- first_documented_use_in_beer
- 9th century
- major_producers
- Germany and United States (three-quarters of world production)
Lore & Background
Hops are the female flowers of the hop plant, a vigorous climbing herbaceous perennial. Only female plants are used for commercial production, as pollinated seeds are undesirable for brewing. The plants are trained to grow up strings in fields called hopfields, hop gardens, or hop yards. Many different varieties are grown worldwide, with different types used for particular beer styles. Before hops became common, brewers used a 'gruit' composed of various bitter herbs and flowers, including dandelion, burdock root, marigold, and heather. Early hop cultivation is often associated with the Hallertau region, but the first documented date is not universally agreed upon; one early reference is a hop garden mentioned in the will of Pepin the Short (768), father of Charlemagne.
Reader's Guide
Hops have been central to beer brewing for over a millennium, providing bitterness, flavour, aroma, and antibacterial properties that help preserve beer and suppress undesirable microorganisms. Their use replaced earlier gruit mixtures, partly because hopped beer was less prone to spoilage. The economic and social impact of hop cultivation was significant, especially during harvest when large numbers of migrant workers, including entire families, travelled to hop-growing regions. In England, hop picking in Kent drew London families, and in Worcestershire, people from Birmingham and other Midlands cities. The often-appalling living conditions of hop pickers led to reform efforts, such as those by the Rev. John Young Stratton in Kent in 1866. Today, hops are grown in moist temperate climates, with Germany and the United States accounting for three-quarters of world production. Major growing regions include the Hallertau in Germany, the Žatec (Saaz) in the Czech Republic, and the Yakima and Willamette valleys in the United States. The invention of the mechanical hops separator in 1909 by Emil Clemens Horst greatly improved harvesting efficiency. Hops are dried in oast houses or kilns and often processed into pellets for longer storage. The lupulin in hop cones contains lupulone and humulone, which possess antibiotic properties that favour brewer's yeast growth.
Did You Know?
- The first documented hop cultivation was in 736 in the Hallertau region of present-day Germany.
- Hops were condemned in England as late as 1519 as a 'wicked and pernicious weed'.
- Only female hop plants are used for commercial production, as pollinated seeds are undesirable for brewing.
- The mechanical hops separator was patented by Emil Clemens Horst in 1909.
Frequently Asked Questions
What exactly are Hops?
Hops are the aromatic seed cones—sometimes called strobiles—produced by the climbing vine Humulus lupulus, a member of the Cannabaceae family. In brewing, they serve as the primary source of bitterness, flavor complexity, and natural preservation.
What do Hops actually do in a beer?
They balance the sweetness of malt by adding bitterness while contributing floral, fruity, or citrus notes to the aroma. They also act as a natural preservative thanks to antibacterial compounds found in their resins.
Why are only female hop plants grown commercially?
Humulus lupulus has separate male and female individuals, and it is the female cones that develop the resinous lupulin glands brewers need for flavor and preservation. Male plants don't produce those structures, so they are essentially useless in a commercial hopfield.
How far back does the history of Hops go?
The earliest documented references appear in the 8th or 9th century, including a mention in Pepin the Short's will dated 768. The Hallertau region in Germany later became one of the world's most renowned growing areas.
Which countries grow the most Hops?
Germany and the United States together account for roughly three-quarters of global production. The vines are trained up strings in dedicated fields known as hopfields, hop gardens, or hop yards depending on the region.
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