Brewer's guide
Anatomy of hops
Everything you need to know about the hop cone - from lupulin gland structure through chemical composition, essential oil profile, the journey from field to brew, growing geography, and the history of varieties.
Cone anatomy
A hop cone (strobilus) is the female inflorescence of Humulus lupulus. Beneath the bracts and bracteoles hide lupulin glands - yellow grains packed with resins and oils that give beer its bitterness and aroma.
Longitudinal section
Hover or tap a part to highlight it.
What's inside
Dry cone mass is mostly cellulose and proteins, but brewers care about two percent: alpha acids, beta acids and essential oils. These determine IBU and aromatic character.
Dry cone mass
100%
What brewers care about
Of the whole cone, only a few percent actually matter - bitterness, aroma and character come from these. The rest is filler.
- Alpha acids2–15%
After isomerization in the boiling wort they give beer its bitterness. Higher percentage = less hops needed.
- Beta acids2–10%
Oxidize more slowly, contribute soft, lingering bitterness. Important for lagered beers.
- Essential oils0.5–3%
Aroma. Most boil off during the boil - to preserve them, hops are added late or as dry hop.
- Cellulose & lignin42%
- Proteins15%
- Water10%
- Lipids, minerals, ash13%
- Polyphenols5%
Essential oils
Myrcene, caryophyllene, humulene, farnesene, linalool - five main oils that shape the aromatic profile. Each contributes a different note: citrus, pepper, wood, fruit.
Profile comparison
Classic noble hops have a balanced profile dominated by humulene. Modern aromatic hops are mostly myrcene - intense citrus and tropical notes.
wood · herbal · noble · floral · fruity · green
citrus · resin · pine
- Myrcenecitrus · resin · pine
- Humulenewood · herbal · noble
- Caryophyllenepepper · wood · herbal
- Farnesenefloral · fruity · green
- Linaloolfloral · lavender · citrus
From cone to beer
Fresh cone, pellet, T90, lupulin powder, cryo, extract - hops reach the kettle in many forms. Timing (60 min boil, whirlpool, dry hop) determines what you'll extract.
Cultivation & harvest
Hops grow up vertical lines to 7 m tall. Harvested once a year, August-September. One hectare yields 1.5-2 tonnes of cones.
Drying & processing
Fresh cones are dried to 10-12% moisture, milled and pressed. Most common forms: T90/T45 pellets, lupulin powder, cryo, CO₂ extract.
Bitterness (60 min boil)
Hops added at the start of the boil isomerize alpha acids into bitter compounds - IBU. Roughly 90% of essential oils boil off.
Aroma (whirlpool / dry hop)
Hops added late in the boil (whirlpool) or cold (dry hop) preserve essential oils. These create the aroma in finished beer.
Where hops grow
Hops are grown in a narrow band of latitudes - between 35° and 55° on both hemispheres. USA, Germany, Czechia, Poland, UK, New Zealand, Australia - each region gives cones a different character.
Northern hemisphere
35° – 55° N
Germany
Czech Republic
Poland
United Kingdom
Slovenia
USASouthern hemisphere
35° – 55° S
Australia
New ZealandLatitude band: 35° – 55° on both hemispheres. Hops need ~15 hours of daylight in summer and a frosty winter for their growth cycle - both conditions only occur in these two narrow climate bands. Closer to the equator: no frost. Closer to the poles: not enough light.
Germany - Hallertau (Bavaria)
Europe's oldest hop-growing region. Classic noble hops: Hallertau Mittelfrüh, Tettnang, Spalt.
ha cultivated
20 400
tonnes/year
47 000
Czech Republic - Žatec (Saaz)
Home of Saaz - soul of Czech pilsners. Delicate, herbal, floral profile.
ha cultivated
5 100
tonnes/year
8 200
Poland - Lublin region
Lubelski (Poland's only noble variety), Marynka, Iunga. Spicy, herbal notes.
ha cultivated
1 600
tonnes/year
2 800
United Kingdom - Kent, Worcestershire
Classic English varieties: Fuggle, East Kent Goldings, Target. Earthy, woody, lightly fruity.
ha cultivated
950
tonnes/year
1 400
Slovenia - Styria
Styrian Goldings, Aurora, Bobek. Lightly spicy, between noble and aromatic.
ha cultivated
1 600
tonnes/year
2 700
USA - Yakima Valley, Pacific Northwest
Capital of modern hops. Citrus, tropical, resin, pine. Citra, Mosaic, Simcoe, Cascade, Centennial.
ha cultivated
24 500
tonnes/year
53 000
Australia - Tasmania, Victoria
Galaxy, Vic Secret, Ella, Eclipse. Intensely tropical, passionfruit, peach.
ha cultivated
550
tonnes/year
1 100
New Zealand - Nelson, Tasman
Nelson Sauvin, Motueka, Riwaka, Wai-iti. Wine-fruity, tropical, unique profiles.
ha cultivated
440
tonnes/year
950
History at a glance
From 736 AD in Hallertau, through English Fuggle (1875), American Cascade (1972) and Citra (2007), to modern hybrids - hops evolve alongside the beer styles they brew.
Medieval
736First mention - Hallertau
Earliest documented hop cultivation in Bavarian Hallertau. Monastic abbeys begin experimenting with hops in beer.
Medieval
1079Hildegard of Bingen
German mystic describes hop's preservative properties in beer. „Physica” - the first book describing hops from a scientific perspective.
Early Modern
1516Reinheitsgebot
Bavarian beer purity law - hops officially listed as one of four allowed ingredients (water, malt, hops, yeast).
Industrial era
1875Fuggle - English classic
Richard Fuggle breeds his variety in Kent. Becomes synonymous with English ales - Porter, Stout, English Bitter.
Craft beer era
1972Cascade - American revolution
USDA releases Cascade - the first modern American hop. Citrus, grapefruit aroma. Cornerstone of the 80s-90s craft beer revolution.
Craft beer era
2007Citra - the C-hop era
Modern aromatic hop with intense tropical-citrus profile. Defines the NEIPA style and a whole generation of new craft beers.
Craft beer era
2012+Hybrid era
Mosaic, Galaxy, Nelson Sauvin, Sabro, Strata - explosion of unique varieties from around the world. New hybrids appear every year.