READ · COMPARE · EXPLAIN
Sémillon: Comparing dry bottle-aged styles and botrytised sweet wines
Examining Bordeaux blends and botrytis, and bottle aging in Hunter Valley. Match aroma descriptors to production methods and compare the roles of Sémillon in each.
Questions for this course
Can aromas reminiscent of honey and toast be considered evidence of sweetness or barrel aging?
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 ↓Semillon / Learn from Grapes
Aliases & spellings: Sémillon
Update date: 2026-09-23
Bordeaux offers both dry and sweet styles.
Sémillon is used in Bordeaux both for dry whites blended with Sauvignon Blanc and for sweet wines. When affected by botrytis, water is lost from the fruit, concentrating sugars and other components. When learning about sweet styles, read not just the grape variety but also how the fruit was concentrated and how much sugar remains post-fermentation.
No barrel used; changes occur in the bottle.
In Hunter Valley, there is a style of Semillon aged in bottle without the use of barrels. According to Wine Australia, youthful citrus notes develop with bottle age into aromas reminiscent of honey and toast. Observing toasty notes and deciding that oak barrels were used are not the same thing as understanding the winemaking process.
Read about the producer’s release policy
Brokenwood’s ILR Reserve Semillon is an aged white without barrel usage. After transitioning to screwcap closures, the producer extended the bottle maturation period before release to six years—this is their company’s policy. Do not equate it with regional minimum ageing rules; confirm these procedures for each label.
What to align and what to compare.
Reading the raw material
- Conditions to standardize
- Sémillon
- Conditions for comparison.
- Normal harvest and concentration by botrytis
- Additional points to confirm
- check against residual sugar in the finished product
Reading aromas
- Conditions to standardize
- Expressions of honey and toast.
- Conditions for comparison.
- Bottle aging, use of barrels, sweetness/dryness
- Additional points to confirm
- Do not use aromas to prove a winemaking step.
Reading Time
- Conditions to standardize
- Description of maturation period
- Conditions for comparison.
- Producer’s policies and legal requirements
- Additional points to confirm
- Whose and which wine’s record this is
Order of reading and key points to consider in each article
0 / 4 articles completed
Next article →Progress is recorded as the completion of reading articles. This does not include completion of explanatory assignments.
- 1↗
France
Bordeaux
Read about the use of white grape varieties in both dry and sweet wines.
- 2↗
France
Compare mechanisms by which sweetness is retained
Distinguish botrytis from other concentration methods.
- 3↗
Australia
Hunter: Warm region Semillon
Observe harvest timing and white wine styles in warm regions.
- 4↗
Australia
Producer Case Study: Barrel-less Aged Sémillon
Check the winemaking and bottle ageing period before release for ILR.
READ · HYPOTHESIZE · RECONSIDER
Reading Sémillon: Compare dry bottle-aged and botrytised sweet wines
Cross-check imaginary tasting notes with winemaking records to revise assumptions based on aromas.
This is a fictitious example created for study purposes. It does not represent analytical values of any particular producer or vintage.
A is indicated as dry, B as a sweet white wine mainly from Sémillon.
| Item | A | B |
|---|---|---|
| Raw material | No botrytis sorting | Selection of noble rot grapes |
| Barrel | Not used | Used |
| Aging | 6 years in bottle. | Bottled after aging in barrel |
| Tasting notes | Citrus, honey, and toast impressions. | Impressions of apricot and honey |
Each hypothesis or reflection can be up to 2,000 characters. You can save your answers even if you only select an option.
Manually save to this browser. When you reopen, you can continue from where you left off. This is a separate record from the course explanation task notes. If you save with all fields unselected or blank, this exercise record will be deleted.
Read the explanation for each question
By answering in the selection field, you can compare your answers and explanations using the top button. Freeform responses will not be automatically graded.
Which A has documented honey aromas?
Aromas are distinct from the sweetness or residual sugar you perceive on the palate. A is explicitly labeled as dry.
How would you describe the impression of toast in A?
Hunter Valley Semillon is an example of this. You cannot infer barrel use solely from tasting aromatic descriptors.
In B, which process is related to pre-harvest concentration?
Botrytis causes water to be lost from the fruit, concentrating sugars and other components. This is a different stage from subsequent fermentation and aging.
Basis and sources for the exercise
Practice exercises in comparison
Cross-check imaginary tasting notes with winemaking records to revise assumptions based on aromas.
Read examples of organizing comparisons
| Conditions for Comparison | Botrytis reference material | Bottle aging documentation |
|---|---|---|
| Subject | Condition of the fruit at harvest | wine and time after completion |
| Main points to confirm | Concentration, sorting, residual sugar | Barrel use, duration, storage conditions. |
| Do not confuse | Do not assume botrytized wine based solely on honey aromas. | Don’t conclude it’s oaked just from toasty aromas |
This is an organized study tool based on the designated articles for this course. You can check specific facts and sources in each article.
Explain in your own words
Do not simply sum up the two Sémillons as 'sweet with honey aromas'; instead, explain following the details from each source.
Check after writing
- Did you distinguish aroma from sweetness/dryness?
- Did you distinguish bottle maturation from barrel use?
- Did you indicate the differences in the raw materials between A and B?
Save response to explanation task
Compare your initial thoughts with how they have changed after reading the article.
Maximum 5,000 characters. This is stored within this browser. Press "Save" to record your note. Saving a blank will delete this note.
View saved notes →