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How cider apples are classified

What does bittersweet mean, and who decides?

In short

Bittersweet is a class in the Long Ashton classification, the English scheme that sorts cider apples by whether the juice sits above or below a threshold for acid and a threshold for tannin. A bittersweet is low in acid and high in tannin.

It is one scheme among several, and not the most detailed. France sorts fruit into five families on different thresholds; Asturias into nine technological blocks on acidity and phenolics, four of which describe compound characters that English simply has no word for; and perry pears use a fourth arrangement that behaves differently again, because pear tannin is not apple tannin.

The same variety can legitimately fall into different classes under two systems, and can move between classes when it is grown somewhere else. That is measured rather than supposed: Washington State University publishes both its thresholds and its figures, and seventeen of its seventy-three cider cultivars sit in a different quadrant from the class they carry in England. This is why every classification statement on this site names its system, its source and, where there is one, its measured basis.

Cider apples placed on acid and tannin axes, split at roughly 0.45% w/v acid and 0.2% w/v tannin.

Described in full

The two axes: Total acid, as malic acid in percent weight per volume of pressed juice, runs up the vertical axis. Tannin, also in percent weight per volume, runs along the horizontal axis. Both thresholds are drawn as dashed lines.
The thresholds: Acid divides at roughly 0.45% w/v; tannin at roughly 0.2% w/v. These are the figures the Long Ashton scheme states, derived from Somerset fruit analysed in the first half of the twentieth century.
Sweet, lower left: Low acid and low tannin. Contributes fermentable sugar and softness but no structure. Examples on the figure: Sweet Coppin and Taylor’s.
Bittersweet, lower right: Low acid with high tannin. The class with no equivalent in dessert fruit and the backbone of West Country blends. Examples: Dabinett and Yarlington Mill.
Sharp, upper left: High acid with low tannin. Supplies acid lift and a lower pH, which reduces bacterial spoilage risk. Examples: Browns Apple and Court Royal.
Bittersharp, upper right: High acid and high tannin together — the rarest class, and the one the recognised single-varietal cultivars cluster in. Examples: Kingston Black and Foxwhelp.
What the quadrants do not tell you: The scheme measures total tannin, not the distribution of chain lengths that decides how much of the effect is bitterness and how much astringency. It says nothing about aroma, nitrogen or fermentation behaviour.
Fruit near a boundary: Several cultivars sit close enough to a threshold that sources place them on different sides in good faith — Kingston Black is recorded as both bittersharp and sharp. The same fruit grown somewhere warmer commonly ripens to lower acid and can cross a line.

The five systems

The last of these is a different kind of object from the other four. It classifies ciders for judging rather than fruit for blending, it has no legal standing, and it was drawn where a competition needed boundaries. It is included because it is widely used and frequently mistaken for a description of traditions.

The classification systems CiderHQ uses, and what each is for.
System	Where from	Classes	What it sorts on
Long Ashton	England — the National Fruit and Cider Institute, from Somerset-grown fruit	Sweet, sharp, bittersweet, bittersharp	Two thresholds: total acid around 0.45% as malic, and tannin around 0.2%
French cider apple families	France — codified by the Institut Français des Productions Cidricoles	Douce, douce-amère, amère, acidulée, aigre	Acid and polyphenol content, with a distinct very-tannic amère class the English scheme does not separate
Asturian technological blocks	Spain — characterised by SERIDA, published by the Consejo Regulador of DOP Sidra de Asturias	Nine: dulce, dulce-amargo, amargo, semiácido, semiácido-amargo, amargo-semiácido, ácido, ácido-amargo, amargo-ácido	Total acidity — reported as sulphuric acid, not malic — and total polyphenols as tannic acid
Perry pear classification	England — developed alongside the Long Ashton perry pear work	Sweet, medium sharp, bittersweet, bittersharp	Acid and tannin in pear juice, on the same four-quadrant logic
BJCP cider categories	United States — a competition judging framework	Standard, speciality and historical categories	The finished drink rather than the fruit: origin, method, additions and expected sensory range

What happens when the same fruit is grown somewhere else

The clearest test of whether a class describes a fruit or a place comes from Washington State University, which grew a multinational collection of cider apples at Mount Vernon in the Skagit Valley — a cool maritime site, the closest North American analogue to the English West Country — and published its thresholds alongside its figures. That combination is unusual and it is what makes the result checkable: anyone can recompute the classification from the numbers.

Recomputing it produces a disagreement. Seventeen of the seventy-three cultivars in the programme’s database sit in a different quadrant from the class they are listed under, and the listed class is the one the fruit carries in England. Michelin, a Norman bittersweet planted across Herefordshire for a century, measures 0.14% tannin at Mount Vernon — below the 0.2% threshold that makes a fruit bitter at all. Brown Snout, Bedan and Fillbarrel do the same. The site says so itself: “some cultivars are classified differently at this site than they were classified in England.”

The peer-reviewed work behind the database states it as a finding rather than a footnote. Across eighteen cultivars assessed from 2000 to 2015, three carried less tannin than Long Ashton had historically recorded for the same fruit, and the classification of three differed from the English one — attributed by the authors to differences in climate and management. A separate four-season study of Brown Snout, Dabinett, Kingston Black and Yarlington Mill across two Washington climates found something sharper still: all four fell below 0.20% tannin and “would not be classified as bitter, unlike their historical classification at LARS”.

The same study is worth reading for what it did not find. Region made no significant difference to any of the five juice characteristics measured — cool maritime Washington and hot dry Washington gave statistically indistinguishable juice — but season did, with tannin highest in 2012 and specific gravity lowest in 2013. The lesson is not that climate does not matter. It is that the year matters at least as much as the place, and that a classification derived from one site over one period is a snapshot of both.

This is why the site never states a class without its systemA cultivar page here can carry a Long Ashton class from Somerset and a different implied class from Washington at the same time, with both shown and neither corrected to agree with the other. Averaging them, or picking the older one because it is traditional, would destroy the only interesting thing the two figures say together.

Why the systems disagree

The thresholds were set locally. Long Ashton derived its cut-offs from fruit grown at one Somerset site in the first half of the twentieth century. The French families were fitted to Normandy and Breton fruit; the Asturian classes to Asturian cultivars. Each is internally consistent and none was intended as a universal standard.

They also carve the space differently. The French scheme separates an amère class more tannic than the English bittersweet band, and uses it in small proportion. The Asturian scheme has a semiácida class with no English equivalent at all, and it is the largest group among the varieties permitted under the Asturian designation. Mapping one scheme onto another therefore loses information rather than translating it.

And the fruit itself moves. Acid falls and sugar rises as fruit ripens further in a warmer season, so a variety near a threshold can sit on one side in a cool year and the other in a warm one, or on different sides in England and in a warmer climate. Several well-known varieties are placed differently by different sources in good faith for exactly this reason.

What a class does and does not tell you

It tells you what the fruit contributes to a blend — acid, tannin, both or neither — which is what the schemes were built for.
It does not tell you about aroma, sugar level, nitrogen or fermentation behaviour, all of which matter as much to a finished cider.
It does not distinguish tannin chain length, and chain length rather than total tannin decides how much of the effect is bitterness and how much astringency.
It does not predict what a single-varietal cider from that fruit will taste like, because the schemes describe contributions rather than complete drinks.
It is not stable across climates, so a class recorded in one country should not be quoted as a property of the variety everywhere.

Also answered on this page

Questions this page covers, so you can tell at a glance whether it is the one you want.

What is a bittersharp apple?
Is bittersweet a French term too?
Why do sources disagree about an apple’s class?
What is a semiácida apple?
Does classification predict how a cider will taste?

What people ask next

Questions readers ask about the things this page mentions. Each one goes to the section that answers it rather than to a page written to receive the question.

What are the best apples for cider — There is no best apple, because a cider is a blend of properties rather than a fruit. What a blend needs is tannin, acid and sugar in some balance, and the classification systems exist to say which fruit supplies which — a bittersweet brings tannin and body, a sharp brings acid and a safer pH.
What is dabinett — The most widely planted English cider apple: a late bittersweet with soft, full tannin that ferments into a cider needing very little added to it. Long Ashton measured it at 0.18 per cent acid and 0.29 per cent tannin.
What is the difference between bitterness and astringency in cider — Bitterness is a taste, detected by receptors on the tongue. Astringency is not a taste at all: it is a mechanical sensation caused by tannins binding and precipitating the proline-rich proteins in saliva, which strips away the lubricating film in the mouth.
How does the french classification of cider apples differ from the english one — The English scheme cuts fruit four ways on acid and tannin; the French scheme cuts it five ways and separates amère from douce-amère, a distinction English has no word for. The French thresholds are also stated in grams per litre with acidity as sulphuric acid, so the numbers do not compare directly.
What is kingston black — Kingston Black is a Somerset bittersharp with an unusual balance of acid and tannin, long regarded as capable of making a complete cider unblended. It is difficult to grow well, which is why it is scarcer than its reputation suggests.
What is the difference between a bittersweet and a bittersharp apple — Both are high in tannin; the difference is acid. Under the Long Ashton scheme a bittersweet sits below roughly 0.45% acid and a bittersharp above it, so a bittersharp brings sharpness as well as bitterness to a blend.

Sources

What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.

Long Ashton Research Station cider fruit analyses
National Fruit and Cider Institute / University of Bristol · research institute · registered as competent for this subject · covers 1903–2003
The foundational body of cider-fruit science in English. Long Ashton produced the acid-and-tannin classification that divides cider apples into sweet, sharp, bittersweet and bittersharp, and analysed hundreds of cultivars grown at its Somerset site. Its figures are historic measurements of specific fruit at a specific place, not universal constants — a distinction CiderHQ preserves in every measurement record that cites it.
Institut Français des Productions Cidricoles (IFPC)
IFPC · research institute · retrieved 2026-08-24
The French technical institute for cider production. The authority for the French cultivar classification families, for keeving as an industrial process, and for the pectin and nitrogen chemistry that keeving depends on.
Denominación de Origen Protegida Sidra de Asturias
Consejo Regulador de la DOP Sidra de Asturias · designation authority · passage verified 2026-08-24
The regulating council for Asturian cider. Read on 2026-08-24, and it turned out to carry far more than a permitted-variety list: an agronomic and technological characterisation of each admitted variety, with total acidity, total polyphenols, vigour, flowering, ripening, cropping and susceptibility to fungal disease. The characterisation is credited to SERIDA’s fruit-research programme. Two things it settles are corrections to what CiderHQ previously held: Asturias sorts cider fruit into nine technological blocks rather than five, and it publishes acidity as sulphuric acid rather than malic. The figures are transcribed into `data/trials/serida-asturias.ts` and cite this source, because this is where they were read.
National Perry Pear Centre
National Perry Pear Centre, Hartpury · specialist organisation · passage verified 2026-08-24
Read on 2026-08-24 — and the address CiderHQ had registered, perrypears.co.uk, is no longer the Centre at all. It fails the TLS handshake over https, and over plain http it resolves to a Sedo domain-parking page: an earlier pass in this sprint recorded it as retrieved on the strength of an HTTP 200, which was wrong, and the correction is the point. The Centre publishes at nationalperrypearcentre.org.uk. It is the closest thing British perry has to an identity authority: it holds at least two examples of most known varieties, states that the DNA of most of them has been determined and is used as an aid to identification, and publishes a variety register with synonym lists. Its 121-variety register is transcribed into the perry pear records, including the nineteen names it shows being claimed by more than one variety.
BJCP Beer Style Guidelines — cider and perry categories
Beer Judge Certification Program · classification framework · retrieved 2026-08-24
Opened on 2026-08-24, and the edition matters. CiderHQ registered the 2015 cider guidelines; BJCP has since published a 2025 cider edition, and the old URL now redirects into the current guidelines index. A competition style guide is a dated framework rather than a standing definition, and citing the wrong edition of one is the same class of error as citing a superseded specification. CiderHQ treats BJCP as one competition framework among several and never as the universal cider taxonomy.
A Somerset Pomona: The Cider Apples of Somerset
Liz Copas, The Dovecote Press, 2001. ISBN 9781874336877 · reference work · bibliographic record verified, not opened 2026-08-25
Bibliographic record verified on 2026-08-25 against Open Library: Liz Copas, The Dovecote Press, 2001, ISBN 9781874336877. The author was Long Ashton’s cider pomologist, which is why this work is registered for Somerset cultivar identity at all — it is the nearest thing to a successor to the station’s own descriptions. No copy was opened. Not digitised in any open collection.
Washington State University cider research programme
Washington State University Northwestern Washington Research and Extension Center · university · passage verified 2026-08-24
The single most useful open cider dataset CiderHQ has found. The programme’s cultivar performance database gives juice chemistry, orchard behaviour, bloom and harvest timing and cider-maker tasting notes for 73 cultivars grown at one maritime site over fifteen years, and — unusually — publishes its classification thresholds alongside its figures, so the classification can be checked rather than taken on trust. It also states outright that its results diverge from the English ones. Read in full on 2026-08-24 and transcribed into `data/trials/wsu-mount-vernon.ts`; four published figures were found to be impossible and are withheld there with their reasons.
Evaluation of Flower, Fruit, and Juice Characteristics of a Multinational Collection of Cider Apple Cultivars Grown in the U.S. Pacific Northwest
Miles, King, Alexander and Scheenstra, HortTechnology 27(3):431–439 · peer-reviewed literature · passage verified 2026-08-24 · covers 2000–2015
The peer-reviewed companion to the WSU cultivar database, and the paper that states the reclassification finding as a result rather than as a website footnote. Eighteen cultivars — four American, nine English, four French and one Danish dessert apple — grown at Mount Vernon and assessed over fifteen seasons. The full text sits behind a publisher wall that refuses automated retrieval; the abstract carries the findings below verbatim and was read through the Semantic Scholar record for the DOI.
Regional Variation in Juice Quality Characteristics of Four Cider Apple (Malus ×domestica Borkh.) Cultivars in Northwest and Central Washington
Alexander, King, Zimmerman and Miles, HortScience 51(12):1498–1502 · peer-reviewed literature · passage verified 2026-08-24 · covers 2012–2015
A designed test of the question every cultivar page implicitly raises: does the same fruit give different juice in a different climate? Brown Snout, Dabinett, Kingston Black and Yarlington Mill, at four orchards across a cool maritime region and a hot dry one, over four seasons. The answer is more interesting than a yes: within Washington the region made no significant difference, but the season did — and all four cultivars sat below the tannin threshold that would have made them bitter under the English scheme. The paper also supplies the numeric definition of the English classes as the cider literature states them, attributed to Barker and Burroughs (1953).

Where to go next

Learn about cider — The rest of the introductory material, grouped by the question it answers.
Glossary — Any word on this page you did not recognise, defined in one or two sentences.
Comparisons — What separates cider from the drinks it is most often confused with.