Hopedia

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.

01 / 06

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.

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  1. 1

    Stem (peduncle)

    Connects the cone to the rest of the plant - nutrients flow through it during vegetation.

  2. 2

    Strig (central axis)

    The cone's central core. All bracteoles and bracts attach to it.

  3. 3

    Bract (outer leaf)

    Large outer leaves giving the cone its characteristic shape. They contain little active matter themselves.

  4. 4

    Bracteole (inner leaf)

    Smaller inner leaves. Lupulin glands sit at their base - the heart of the hop.

  5. 5

    Lupulin glands

    Yellow grains packed with alpha acids, beta acids and essential oils. This is what hops are grown for.

02 / 06

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%
03 / 06

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.

Noble (Saaz)

wood · herbal · noble · floral · fruity · green

Modern (Citra)

citrus · resin · pine

  • Myrcenecitrus · resin · pine
  • Humulenewood · herbal · noble
  • Caryophyllenepepper · wood · herbal
  • Farnesenefloral · fruity · green
  • Linaloolfloral · lavender · citrus
04 / 06

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.

Step 1

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.

α - bitterness100%
Oils - aroma100%
Step 2

Drying & processing

Fresh cones are dried to 10-12% moisture, milled and pressed. Most common forms: T90/T45 pellets, lupulin powder, cryo, CO₂ extract.

α - bitterness95%
Oils - aroma85%
Step 3

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.

α - bitterness30%
Oils - aroma10%
Step 4

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.

α - bitterness5%
Oils - aroma80%
α - bitterness (preserved / lost)Oils - aroma
05 / 06

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

GermanyCzech RepublicPolandUnited KingdomSloveniaUSA

Southern hemisphere

35° – 55° S

AustraliaNew Zealand

Latitude 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

06 / 06

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.

  1. Medieval

    736

    First mention - Hallertau

    Earliest documented hop cultivation in Bavarian Hallertau. Monastic abbeys begin experimenting with hops in beer.

  2. Medieval

    1079

    Hildegard of Bingen

    German mystic describes hop's preservative properties in beer. „Physica” - the first book describing hops from a scientific perspective.

  3. Early Modern

    1516

    Reinheitsgebot

    Bavarian beer purity law - hops officially listed as one of four allowed ingredients (water, malt, hops, yeast).

  4. Industrial era

    1875

    Fuggle - English classic

    Richard Fuggle breeds his variety in Kent. Becomes synonymous with English ales - Porter, Stout, English Bitter.

  5. Craft beer era

    1972

    Cascade - American revolution

    USDA releases Cascade - the first modern American hop. Citrus, grapefruit aroma. Cornerstone of the 80s-90s craft beer revolution.

  6. Craft beer era

    2007

    Citra - the C-hop era

    Modern aromatic hop with intense tropical-citrus profile. Defines the NEIPA style and a whole generation of new craft beers.

  7. 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.