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Dönnhoff: Dellchen and Hermannshöhle
Dönnhoff is a producer based in Oberhausen, Nahe. They produce Riesling from vineyards such as Dellchen and Hermannshöhle. Here, you will read technical data for the 2025 dry GG wines, comparing how differing site conditions influence wines of the same vintage, variety, and category.
For the 2025 GG from two vineyards, there are both common conditions and differing numbers. Compare vine age and yield, distinguishing by range, maximum, and approximate values.
Questions for this course
Can we directly compare a range of vine ages with a maximum vine age?
Before you start reading, briefly jot down your thoughts. You will rephrase them at the end.
To applied practice using the material ↓
To explanation task notes ↓Dönnhoff / Learn from Producers
Germany / Nahe / Oberhausen
Other names & notations: Dönnhoff / デーンホーフ / Donnhoff
Update date: 2026-09-25
Compare dry Rieslings from the same year.
The subjects are the 2025 Dellchen and Hermannshöhle Riesling GG. Both are dry, and resources state they spend at least 6 months on full lees, then at least 2 further months on fine lees. Placing the shared conditions first helps organize comparisons to read the differences between vineyards.
Vine age is not given in the same type of figure
Dellenberg vines are reported as 15–45 years old, while Hermannshöhle reaches up to 75 years. The first is a range, the latter an upper limit. You cannot, from this data alone, calculate an average age difference or claim that every vine in Hermannshöhle is 75 years old.
Do not convert yield or geology into quality scores.
The yield data in the documentation: Dielchen is about 40 hl/ha, Hermannshöhle about 35 hl/ha. Differences such as slate or volcanic rocks are also explained in the soil description. Do not judge superiority by yield or vine age alone; record these as multiple vineyard conditions. Also, avoid directly inferring specific aromas from soil names.
What to align and what to compare.
Aging
- Conditions to standardize
- 2025 dry Riesling GG
- Conditions for comparison.
- At least 6 months on full lees, and at least 2 months on fine lees are standard
- Additional points to confirm
- Are the two documents from the same year edition?
Vine age
- Conditions to standardize
- Compare Dellchen and Hermannshöhle from the same year.
- Conditions for comparison.
- The range of 15–45 years and the maximum of 75 years
- Additional points to confirm
- Are you mistakenly comparing two averages?
Yield
- Conditions to standardize
- The same two sources.
- Conditions for comparison.
- About 40hl/ha and about 35hl/ha
- Additional points to confirm
- Are you turning approximate numbers into scores for quality or an all-year common value?
Order of reading and key points to consider in each article
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Interpreting data from Dönnhoff: Dellchen and Hermannshöhle
Compare the stated conditions in the documentation. Numbers specifying vintages should be treated as information for that specific year.
This summarizes materials published by producers, regional groups, and importers. Each source includes the publisher and the date the material was checked.
| Comparison items | What can be determined from the materials | Ability to distinguish by reading |
|---|---|---|
| Common conditions for 2025 | Riesling, dry GG, at least 6 months on full lees plus at least 2 months on fine lees | First confirm the conditions common outside the vineyard |
| Dellenberg | Vine age 15–45 years, yield about 40 hl/ha | Read as a range or approximate value. |
| Hermanshehle | Maximum vine age of 75 years, yield about 35 hl/ha | Do not treat the maximum value as the average or as the age of all vines |
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Read the explanation for each question
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What can you infer from the statement "up to 75 years"?
The word "maximum" indicates an upper limit and is neither an average nor a value that applies to every vine. You cannot directly subtract Deilchen’s 15–45 year range to find the difference in average vine age between two vineyards. Make sure to interpret the same type of number.
What conditions are shared in the two 2025 documents?
Both are dry Riesling GGs from 2025, and both explain time spent on gross lees and fine lees. However, vine age and yield data differ. By focusing on common points, you can clarify which vineyard conditions you’re comparing.
How should information such as an approximate yield of 35hl/ha be handled?
The yield shown here is an approximate number from 2025 documentation. The low number itself does not directly determine quality ranking; other factors such as the vineyard and vine age are also relevant. When transferring to explanations for another year, reconfirm the technical documentation for that year.
Practice exercises in comparison
Please explain differences in raw materials and winemaking by reading the table and sources.
Read examples of organizing comparisons
| Conditions for Comparison | Comparison items | What can be determined from the materials | Ability to distinguish by reading |
|---|---|---|---|
| Common conditions for 2025 | Riesling, dry GG, at least 6 months on full lees plus at least 2 months on fine lees | First confirm the conditions common outside the vineyard | |
| Dellenberg | Vine age 15–45 years, yield about 40 hl/ha | Read as a range or approximate value. | |
| Hermanshehle | Maximum vine age of 75 years, yield about 35 hl/ha | Do not treat the maximum value as the average or as the age of all vines |
Sources of materials used for comparison are listed in the text and exercises.
Explain in your own words
For the two 2025 GGs, organize both the commonalities and differences in conditions, and explain what cannot be known from age of vines alone.
Check after writing
- The word "maximum" indicates an upper limit and is neither an average nor a value that applies to every vine. You cannot directly subtract Deilchen’s 15–45 year range to find the difference in average vine age between two vineyards. Make sure to interpret the same type of number.
- Both are dry Riesling GGs from 2025, and both explain time spent on gross lees and fine lees. However, vine age and yield data differ. By focusing on common points, you can clarify which vineyard conditions you’re comparing.
- The yield shown here is an approximate number from 2025 documentation. The low number itself does not directly determine quality ranking; other factors such as the vineyard and vine age are also relevant. When transferring to explanations for another year, reconfirm the technical documentation for that year.
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