What Are Hops? A Beginner’s Guide to one of Beer’s Most Important Ingredients.

Table of Contents- Introduction-The History of Hops-The Science of Hops -Exploring Hops-Hop Brewing Techniques -Conclusion

Introduction: Exploring the World of Hops

Hops became documented in brewing during the 1100s and are the flowers of the hop plant, scientifically known as Humulus lupulus. As close relatives of cannabis, they are often considered the “magical” ingredient in beer and are sometimes the reason people claim they do not enjoy “hoppy beers.”

With more than 200 varieties available, this humble plant plays a crucial role in the brewing process. Whether you like it or not, every beer contains hops on some level. From balancing the sweetness of malt with bitterness to adding floral, citrus, herbal, and tropical fruit notes, hops help define the style of the beer they are found in. Brewers can experiment endlessly with different hop combinations, creating everything from juicy modern IPAs to crisp lagers and traditional European ales.

At the same time, many classic beer styles are strongly tied to specific regional hop varieties and brewing traditions.

Often, the name or style of a beer can hint at the hops used inside it. West Coast beers frequently showcase bold Pacific Northwest hops such as Cascade, Centennial, and Simcoe, while many European lagers rely on Noble hops like Saaz or Hallertau for their delicate herbal and spicy character. Traditional English styles are often associated with hops such as Kent Goldings, although hops are not actually indigenous to the United Kingdom and are believed to have been introduced centuries ago through early Dutch trade routes.

Frequently referred to as a hop “vine,” hops technically grow on a “bine.” Unlike vines, which use tendrils or suckers to climb, bines have stout stems with stiff hairs that help them attach as they grow. Hops grow incredibly fast and, at their peak, can climb 20 to 50 centimetres per week. Interestingly, hop bines wrap clockwise as they grow, with the exception of Humulus japonicus.

Male vs. Female Hop Plants

Hop plants are dioecious, meaning male and female reproductive organs grow on separate plants. Female plants produce the flowers used in brewing and are typically grown without nearby male plants. This prevents pollination and the development of seeds, which can introduce undesirable fatty acids and off flavours into beer.

The History of Hops

The history of hops dates back thousands of years and is closely tied to the evolution of beer itself. While ancient civilizations such as the Egyptians and Mesopotamians used hops in medicine, they did not become a widely accepted brewing ingredient until the Middle Ages. This shift was largely driven by Benedictine monks, who recognized the plant’s preservative qualities and ability to enhance flavour.

Before hops became standardized in brewing, many brewers relied on “gruit,” a mixture of herbs and spices used to flavour and preserve beer. Others experimented with whatever local ingredients were available, including roots, berries, bark, flowers, and other botanicals. While some combinations produced unique flavours, others created inconsistent results, poor shelf stability, and occasionally even unsafe beer.

Hops were a game changer. They not only added a clean bitterness that balanced the sweetness of malt, but also acted as a natural preservative that significantly extended beer’s shelf life. Just as importantly, hops helped bring consistency and stability to brewing, allowing brewers to create safer and more reliable products. This growing preference for standardized brewing practices eventually contributed to Germany’s Reinheitsgebot, or Beer Purity Law, which helped regulate the ingredients used in beer production.

Hop cultivation also shaped regional economies. Areas like the Hallertau in Germany and the Yakima Valley in the United States became world renowned for producing high quality hop cultivars. Today, brewers have access to an enormous range of hybrids and experimental varieties, allowing for endless creativity across every style of beer.

The Science of Hops

Bitterness and Balance

One of the key roles of hops is to balance the sweetness of malt. Hops contain alpha acids, which are released during the boil and contribute bitterness to the beer. Generally, the longer hops are boiled, the more bitterness they impart. Hops added early in the boil are primarily used for bitterness, mid boil additions help contribute flavour, while late boil or post boil additions are used to preserve delicate aromas such as citrus, floral, tropical fruit, and herbal notes. Brewers carefully select hop varieties and timing based on the specific character they want to achieve in the finished beer.

The Natural Preservative

The alpha acids found in hops also have antimicrobial properties that inhibit the growth of bacteria. This became especially important before refrigeration, when beer often spoiled during transport. As global trade expanded, heavily hopped beers proved far more stable on long sea voyages. The Dutch trading companies were among the early adopters of heavily hopped beer for overseas travel, influencing English brewers who later developed what became known as the India Pale Ale, or IPA, a style specifically brewed to survive long journeys to India.

Exploring Hops

While there are hundreds of hop varieties, here are some of the most common hops used by Calgary breweries:

• Citra: Known for intense citrus and tropical fruit flavours such as grapefruit, lime, mango, and passionfruit

• Cascade: A staple of Alberta craft brewing with floral and citrus notes and distinct hints of grapefruit

• Centennial: Often called “Super Cascade,” offering a balanced profile of floral, citrus, and pine

• Simcoe: Known for a unique blend of piney, earthy, and citrus flavours that work well in complex IPAs

• Mosaic: Renowned for tropical fruit, herbal, and earthy notes that add depth and complexity

• Amarillo: Discovered in Washington State and known for vibrant orange and tangerine flavours

• Hallertau: A German Noble Hop with mild herbal and spicy notes perfect for lagers and wheat beers

  
  

How Brewers Choose Their Hops

Brewers consider several factors when selecting hops:

• Flavour profile

• Alpha acid content

• Aroma profile

• Compatibility with malt and yeast

• Availability and seasonal supply
  

Hop Brewing Techniques

To maximize flavour and aroma, brewers use several specialized methods:

• Hop Additions: Timing is everything, including bittering hops early in the boil, flavour hops during the middle of the boil, and aroma hops late in the process

• Whirlpool Hops: Added after the boil but before cooling to extract aroma without excessive bitterness

• Hop Back: A vessel filled with fresh hops that hot wort passes through on its way to the fermenter

• Dry Hopping: Adding hops directly to the fermenter through methods such as traditional dry hopping, hop tea, or hop cannons for maximum extraction

• Temperature Control: Precise fermentation temperatures help preserve delicate hop oils

• Packaging: Cans, oxygen resistant bottles, and cool storage help prevent oxidation and maintain freshness
  

Conclusion

Hops are far more than just the aroma you notice when opening a beer. They work in harmony with other ingredients to create the styles we know and love.

One of the best ways to understand how Calgary brewers use hops differently is to pick a single style, such as a Pale Ale, and try it at every brewery you visit. You will quickly discover that every brewer has their own signature approach. Instead of saying, “Brewery X is my favourite,” you may find yourself saying, “Mr. or Ms. X is my favourite brewer.”

To learn more about hops and other beer ingredients, be sure to sign up for a Calgary Brewery Tour with YYCTOURS.

Cheers and happy drinking!

Frequently Asked Questions About Hops

What do hops do in beer?

Hops add bitterness, aroma, and flavour to beer while also helping balance the sweetness of malt. Depending on the variety and when they are added during brewing, hops can contribute citrus, floral, herbal, tropical fruit, earthy, or piney characteristics.

Are hops related to cannabis?

Yes. Hops and cannabis both belong to the Cannabaceae family, making them close botanical relatives. However, hops do not contain THC and have no psychoactive effects. Similar to cannabis, which has many different strains with unique resins that produce distinct flavours, aromas, and effects, different hop varieties also contain unique oils and compounds that create the wide range of flavours and aromas found in beer.

Why are IPAs more bitter?

India Pale Ales typically use larger quantities of hops, especially during the early stages of the boil, which increases bitterness. Many IPAs also use dry hopping techniques that intensify aroma and hop flavour.

What are the most popular hop varieties?

Some of the most popular hop varieties include Citra, Cascade, Mosaic, Simcoe, Centennial, Amarillo, and Hallertau. Each variety contributes unique flavours and aromas that help define different beer styles.