The new aromatic hop variety “Nobella” developed by Hopsteiner combines a classic and traditional noble hop flavor with consistent alpha acid levels and reliable performance under current climatic conditions. It therefore bridges the gap between tradition and future requirements in aromatic hop breeding.

 

Ensuring Consistent Quality

 

Maintaining raw material quality is becoming increasingly challenging. Climate change intensifies heat and drought stress, increases disease pressure, and causes significant year-to-year variability across all aromatic hop varieties.

Among these hops, noble hops represent a particularly valued subgroup, generally associated with the Saaz, Tettnanger, Spalter, and Hallertauer Mittelfrüher varieties. They are highly appreciated for their delicate and refined aroma profiles and their role in classic beer styles. However, these varieties are increasingly challenged by current growing conditions. Compared with other aroma hops, they show greater variability in yield and alpha acid content, as well as increased sensitivity to environmental stress. This limits their reliability both in the field and in the brewhouse.

At the same time, brewers expect aroma hops to provide not only a classic flavor profile but also a certain bitterness contribution, similar to established varieties such as Hallertauer Tradition.

 

The Hopsteiner Breeding Program

 

For decades, Hopsteiner has been a pioneer in hop breeding and has introduced a wide range of varieties, each developed with a clearly defined brewing objective. This long-term breeding strategy reflects the company’s focus on both brewing relevance and agronomic reliability.

Before a new variety is introduced to the market, breeding lines undergo comprehensive evaluation in three main areas:

  • Agronomic robustness, including strong disease resistance as well as tolerance to drought and heat stress.
  • Agronomic and quality performance, ensuring high and stable yields combined with consistent aroma and bittering profiles.
  • Brewing validation, requiring extensive internal and external trials to confirm that bitterness and aroma profiles meet the expectations of brewers and consumers.

From the initial cross to commercial release, this development process traditionally takes up to ten years. However, the use of advanced sequencing technologies and marker-assisted selection enables faster identification of key traits matching breeding objectives, reducing development cycles to approximately six or seven years under ideal conditions.

To further strengthen this approach, the establishment of an in-house propagation unit represents an important step in Hopsteiner’s breeding and cultivation strategy. This new facility ensures rapid, flexible, and contamination-free multiplication of high-quality plant material through in vitro cultivation under controlled conditions.

 

Agronomic Performance of Nobella

 

Multi-year trials conducted in different European hop-growing regions confirm Nobella’s strong and stable performance.

Nobella provides consistently high yields ranging from 2,500 to 3,000 kg/ha, with potential yields up to 25% higher than traditional noble varieties while maintaining its noble aroma profile.

The variety demonstrates excellent heat and drought tolerance as well as remarkable alpha acid stability, with less than 1% variation across locations and years.

In addition, strong resistance to powdery mildew, good tolerance to downy mildew, and moderate tolerance to Verticillium wilt have been observed.

Overall, its high yield potential and favorable health profile reduce cultivation risks and input requirements, resulting in a lower carbon footprint per unit of hop production compared with traditional noble hops and older aroma varieties.

 

Hop Characteristics – Bittering Compounds

 

The average lead conductance value, according to EBC Analytica 7.5 used to determine hop bittering substances, is 7.6%. This value encompasses all bitter compounds and is primarily used to calculate hop dosage in brewing.

Pure alpha acids account for 6.7%, while a lead conductance value of 7.0% was observed using toluene. This method has been used for decades to monitor raw hop characteristics across harvest years.

In this context, Nobella is comparable to major German aroma varieties such as Hallertauer Tradition and Perle. Due to their relatively high bittering value, these varieties are often used in early kettle additions to contribute partially or entirely to the final bitterness of the beer. Nobella can be used in a similar manner.

Unlike the noble hop group, Nobella possesses a significantly higher concentration of bitter substances. This allows it to achieve the same IBU level in the finished beer with substantially lower hop dosages.

According to current data, approximately 13% of Nobella’s bittering substances consist of “non-alpha bitterness,” composed of unspecified soft and hard resins. This value is calculated by dividing the results of two analytical methods.

In addition to alpha acids, this fraction contributes to beer bitterness and enhances sensory perception. The higher the amount of “non-alpha bitterness” introduced during wort boiling, the more the final bitterness is perceived as smooth, harmonious, and high quality, even in beers exceeding 30 IBU.

 

Hop Characteristics – Aroma Compounds

 

The average essential oil content is 1.2 ml/100 g.

The relative concentration of linalool in Nobella reaches 1.1%, which is relatively high for a classic aroma variety. This terpene alcohol is one of the key aroma components in late-hopped beers.

Thanks to its high concentration of essential oils, particularly linalool, late hop additions can be significantly reduced when Nobella replaces other aroma varieties.

It should be noted that Nobella does not contain farnesene, unlike some classic and noble varieties from the Saaz family. However, after traditional kettle hopping, farnesene can rarely be detected in beer. This aroma compound therefore primarily indicates the genetic origin of a variety rather than dominating the aroma profile of beers brewed with kettle or late hopping.

Thiols are not present in Nobella, and the variety’s thiol impact is classified as “low,” which is also the case for the vast majority of classic hops and all noble aroma hops.

Beyond analytical data, Nobella is often described as having “herbal,” “tea-like,” and slightly “citrus” notes.

 

Outlook and Variety Commercialization

 

Every brewery has its own brands and specific hopping recipes. Hops play a major role in differentiating beers in the marketplace, particularly through aroma profiles, which may be subtle or intense depending on the beer style.

To preserve and enhance this uniqueness, beer production must remain innovative to address future challenges. This also applies to raw materials.

Existing hopping recipes should be reassessed to develop medium-term strategies that enable the adoption of new hop varieties that are both sustainable and climate-resilient.

Once a suitable variety has successfully passed the testing phase, experience shows that a gradual transition is the most effective method for establishing a new hopping recipe.

To support this process, acreage planted with Nobella has been increased fivefold for the upcoming 2026 harvest. The variety is grown across multiple Central European locations, and sufficient quantities are already available to support brewing trials ranging from pilot-scale to commercial applications.

 

Summary

 

Nobella demonstrates the potential of next-generation aroma hops by combining the aromatic heritage of noble hops with modern agronomic performance.

For growers, its disease resistance and climate tolerance ensure a reliable supply of alpha acids and higher yields.

For brewers, Nobella provides not only a fine noble aroma but also an intermediate alpha acid level for bitterness and a high linalool content, making it suitable for both early and late hopping at reduced dosage rates.

Nobella therefore represents a new generation of aroma hops, combining noble heritage, modern performance, efficiency, and resilience to meet the current needs of both growers and brewers.

 

References

 

Olšovská, J.; et al.: SAAZ – Fine Aroma Hop Pedigree: A Review of Current Knowledge, Beverages 2024, 10, 90. https://doi.org/10.3390/beverages10030090

 

https://www.helmholtz-munich.de/newsroom/news/artikel/new-hope-for-bavarian-hop-cultivation-panhop-project-aims-to-breed-resistant-varieties (accessed January 26, 2026).

 

https://www.deutscher-hopfen.de/wp-content/uploads/2025/12/Hopfenrundschau-International-2025-2026.pdf ; pp. 64–65 (accessed January 26, 2026).

 

Arbeitsgruppe Hopfenanalyse (AHA): “The Alpha Acid Content of Hops from the 2025 Crop Year with Updated Averages over Multiple Years”, BRAUWELT International, No. 6, 2025, p. 341.

 

Mitter, W.; Cocuzza, S.: “Special Hop Varieties for Unique Beers – Part 1”, BRAUWELT International, No. 4, 2012, pp. 354–358.

 

Narziß, L.: “There Is More to Hops Than Simply α-Acids”, BRAUWELT International, No. 1, 2010, pp. 17–21.

 

Schmidt, C.; Hoferer, L.; Biendl, M.: “Determination of Variety Dependent ‘Thiol Impact’ Based on LC-MS/MS Analysis of Different Hop Samples Collected Worldwide”, BrewingScience (77), 11/12, 2024, pp. 135–141.

 

``