Cider apple
Stembridge Cluster
A Somerset cider apple from Stembridge that sets its fruit in tight clusters, giving heavy crops of small apples.
Also written Stembridge Clusters.
- Classification
- Bittersweet — Long Ashton classification
- Harvest
- Mid (Late September to mid October)
- Single varietal
- Not suited to a single-varietal cider
- Blend role
- Bulk juice, Bittersweet base
- Origin
- Stembridge, Kingsbury Episcopi, Somerset
- Species
- Malus domestica
- Vigour
- Moderate
- Biennial bearing
- Markedly biennial — heavy and light years alternate
- Keeping
- Moderate
How it is classified
Long Ashton classification
Bittersweet
Low acid, high tannin. The class that has no real equivalent in dessert fruit and that defines West Country cider.
Basis: Below about 0.45% w/v acid and above about 0.2% w/v tannin.
A mild bittersweet on description; no analysis attaches to this cultivar.
Every classification on CiderHQ names its system. Why there is more than one.
What it contributes to a blend
A direction, not a measurement. These bands are the level of resolution the evidence supports, and they say which way adding this fruit pushes a blend rather than what the finished cider will be.
| Axis | Typical | Range |
|---|---|---|
| Acid | Low | |
| Tannin | Moderate | |
| Sugar | Moderate | |
| Bitterness | Slight | |
| Astringency | Noticeable | |
| Aroma | Restrained | |
| Body | Medium |
Description in Somerset cultivar listings. These bands were authored from description; published analyses of this fruit have since been transcribed onto the record from named trial programmes and are shown above. The bands are not derived from those figures, which is why this profile is marked as classified rather than measured.
Adds mild tannin and bulk juice from a heavy crop of small fruit.
Aroma
No aroma descriptors are recorded for Stembridge Cluster, and for a great deal of cider fruit that is a finding rather than a gap. Bittersweet apples in particular contribute tannin, sugar and body while being close to aromatically mute, and most of what a cider made from them smells of was produced by the fermentation rather than carried in by the fruit. CiderHQ publishes the absence rather than filling the space with descriptors nothing supports.
Measured analysis
Each figure is shown with where and when it was taken. They are not averaged: the same cultivar grown in another climate genuinely gives different numbers, and collapsing them into one would be the most misleading thing this page could do.
Measured on the fruit
Measured on the fruit itself, before anything was done to it. These figures hold whatever was later made from the juice.
| Property | Reading | Where | When | Source |
|---|---|---|---|---|
| Fruit diameter | 57 mm (53–61) | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
| Fruit firmness | 78.3 N (74.1–82.5) | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
| Fruit weight | 89 g (72–106) | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
| Starch pattern index | 8.0 SPI | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
Measured on the juice
Measured on juice as pressed, before fermentation. This is where most cider analysis lives and what the classification schemes are defined on.
| Property | Reading | Where | When | Source |
|---|---|---|---|---|
| Brix | 11.3 °Bx (11.1–11.6) | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
| Fructose | 56.6 g/L (24.7–88.5) | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
| Glucose | 22.0 g/L (14.4–29.6) | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
| pH | 3.41 pH (2.81–4.01) | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
| Sorbitol | 7.7 g/L (5.1–10.3) | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
| Sucrose | 10.5 g/L (7.7–13.3) | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
| Titratable acidity | 5.0 g/L (3.8–6.2) | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
| Total phenolics | 930.0 mg/L (900.0–960.0) | USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA | 2017Modern analysis | Cornell University / USDA-ARS Plant Genetic Resources Unit |
How these were measured
- Mean of the fruit sampled per accession; where a bracket is shown it is one standard deviation either side of the mean, not the observed range. Published to two decimal places and shown at the precision CiderHQ displays for the unit.
- Mean of the fruit sampled per accession; where a bracket is shown it is one standard deviation either side of the mean, not the observed range.
- Cornell generic starch–iodine chart, 1–8, where 1 is no hydrolysis and 8 is complete. Mean of replicate fruit; a bracket, where shown, is one standard deviation either side of it.
- Penetrometer, mean of replicate fruit; a bracket, where shown, is one standard deviation either side of the mean.
- Refractometer on pressed juice. Mean of replicates; a bracket, where shown, is one standard deviation either side of the mean.
- Titration to pH 8.2 with sodium hydroxide, reported as malic acid equivalents. Mean of replicates; a bracket, where shown, is one standard deviation either side of the mean.
- Meter on pressed juice before fermentation. Mean of replicates; a bracket, where shown, is one standard deviation either side of the mean.
- Löwenthal permanganate titration, reported by the source as grams per litre of tannic acid equivalent and stored here as milligrams per litre by exact conversion so that it sits in one column with the Folin–Ciocalteu figures the site also holds. The two methods do not measure the same thing and are not interchangeable.
- Enzymatic assay (Megazyme). Mean of replicates; a bracket, where shown, is one standard deviation either side of the mean.
- D-sorbitol/xylitol assay kit (Megazyme), sorbitol dehydrogenase method. Mean of replicates; a bracket, where shown, is one standard deviation either side of the mean.
- A chart position, not a quantity. Almost every accession here scored at or near 8, which says the fruit was picked at or past full starch conversion rather than that the cultivars are alike.
- One harvest at one site. Soluble solids move several degrees between seasons and with crop load.
- A permanganate figure and a Folin–Ciocalteu figure for the same juice can differ by a factor of two. Compare this reading with other permanganate readings, not with a Folin one.
Compare within a study to see where these figures sat among the other cultivars the same work analysed — which is a more robust statement than the figures themselves, because absolute values move between laboratories and the ordering inside one study mostly survives.
Watched in the orchard
What named research programmes recorded about this fruit at their own sites. Bloom, harvest and cropping belong to a place and a run of seasons rather than to a cultivar, so they are reported site by site rather than merged.
USDA-PGRU Malus germplasm characterisation
USDA-ARS Plant Genetic Resources Unit, Geneva, New York, in the Finger Lakes region of western New York State · 2017 · Cornell University / USDA-ARS Plant Genetic Resources Unit
Humid continental, with cold winters and warm summers moderated by the Finger Lakes — a sharper seasonal swing than any of the European cider regions whose fruit the collection holds, and warm enough in late summer to bring acid down faster than a maritime autumn does.
- Held as
- PI 589692, held as “Stembridge Cluster”
One harvest season. Fruit assessed for weight, diameter, starch pattern index on the Cornell 1–8 chart and flesh firmness by penetrometer; juice pressed and measured for soluble solids by refractometer, titratable acidity by titration to pH 8.2 as malic acid, pH by meter, total phenolics by Löwenthal permanganate titration as tannic acid equivalent, and glucose, fructose, sucrose and sorbitol by enzymatic assay.
In the orchard
- Harvest window
- Mid
- Flowering
- Not recorded
- Vigour
- Moderate
- Cropping
- Markedly biennial — heavy and light years alternate
- Keeping
- Moderate
October. The clustered habit makes hand-picking quick and shaking less effective.
Sets fruit in tight clusters, which gives heavy weight per branch and small individual apples. Thinning is impractical and the tree tends to alternate as a result.
No pollination group is recorded.
Disease and pest susceptibility
| Issue | Susceptibility | Note |
|---|---|---|
| Scab | moderate | — |
Juice and pressing
- Low acid
- Mild tannin
- Small fruit with a high skin-to-flesh ratio
How it is used
- A bulk component of south Somerset farm blends
On its own
Not suited to a single-varietal cider
A bulk fruit.
About Stembridge Cluster
Stembridge Cluster is named for how it fruits: tight bunches of small apples along the branch rather than well-spaced individuals. That habit gives heavy crops by weight and makes thinning impossible, which is part of why the tree alternates.
A high proportion of skin to flesh has a real consequence for the juice, since apple phenolics are concentrated in and just under the skin. Small clustered fruit therefore tends to give more tannin per litre than its size suggests, though nothing has been measured for this cultivar and the point is a general one rather than a claim about it.
Names, origin and identity
Cultivar naming is the hardest problem in cider fruit data. The same tree carries different names across ten miles, and two different trees have shared a name for two centuries.
Origin · traditional account
Named for the hamlet and for the tree’s clustered fruiting habit. The origin is otherwise unrecorded.
Related cultivars
Recorded relationships, including the ones this fruit is routinely confused with.
Fruit that plays a similar part
Cultivars sharing a classification under the same system and a comparable role in a blend. Not a similarity score — a stated relationship.
Michelin
A Norman bittersweet raised near Yvetot in the 1870s that became, in England rather than in France, one of the most widely planted cider apples in the world.
Somerset Redstreak
A mild bittersweet planted at very large scale in the late twentieth century for its heavy, regular cropping on bush trees, and a fruit whose commercial importance exceeds its character.
Brown Snout
A Herefordshire mild bittersweet named for the russet patch at its eye, valued for compact growth and regular cropping rather than for concentration.
Bulmer’s Norman
A large, vigorous French-derived bittersweet imported by H P Bulmer and planted across Herefordshire for heavy cropping and mild, plentiful juice.
Hangdown
A Devon mild bittersweet named for its weeping habit, sitting close enough to the tannin threshold that sources place it on both sides of it.
Backwell Red
A north Somerset bittersweet from the village of Backwell, close to Long Ashton itself, giving moderate tannin from a heavy-cropping tree.
Where it grows
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.
- How do you blend cider
- How are cider apples picked
- What is a traditional west country cider blend — Predominantly bittersweet fruit for body and tannin, with a proportion of sharp fruit for acidity and sometimes a smaller share of bittersharps for both. The exact composition varied by farm and by what was in the orchard.
- What is somerset cider
- Why is cider made in the west country — Because the climate suits apples and disappoints wheat and barley: mild, wet winters, heavy soils and a long growing season. Where grain was hard to grow, orchards took its place and cider took beer’s.
Where to go next
- How cider apples are classified — Why there are four schemes and none of them is universal.
- The blend explorer — See which way changing the proportions moves a blend.
- Blending — What a cider maker is actually deciding when they build 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.
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.
University of Reading / Defra, Brogdale · research institute · retrieved 2026-08-24
The UK national reference collection for apple and pear cultivars. The authority CiderHQ uses for whether two names are the same fruit, which is the central duplicate-resolution problem in cider data.
Research Evidence standard for this record. What that means.