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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.

Contribution to a blend, scored 1–5 as a band. The filled segment is the typical value; the paler segments are the range.
AxisTypicalRange
AcidLow
TanninModerate
SugarModerate
BitternessSlight
AstringencyNoticeable
AromaRestrained
BodyMedium
Based on: its recorded classification

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.

Put Stembridge Cluster into a blend

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.

Reported analyses of Stembridge Cluster, by property and source — measured on the fruit
PropertyReadingWhereWhenSource
Fruit diameter57 mm (53–61)USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell University / USDA-ARS Plant Genetic Resources Unit
Fruit firmness78.3 N (74.1–82.5)USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell University / USDA-ARS Plant Genetic Resources Unit
Fruit weight89 g (72–106)USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell University / USDA-ARS Plant Genetic Resources Unit
Starch pattern index8.0 SPIUSDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell 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.

Reported analyses of Stembridge Cluster, by property and source — measured on the juice
PropertyReadingWhereWhenSource
Brix11.3 °Bx (11.1–11.6)USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell University / USDA-ARS Plant Genetic Resources Unit
Fructose56.6 g/L (24.7–88.5)USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell University / USDA-ARS Plant Genetic Resources Unit
Glucose22.0 g/L (14.4–29.6)USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell University / USDA-ARS Plant Genetic Resources Unit
pH3.41 pH (2.81–4.01)USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell University / USDA-ARS Plant Genetic Resources Unit
Sorbitol7.7 g/L (5.1–10.3)USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell University / USDA-ARS Plant Genetic Resources Unit
Sucrose10.5 g/L (7.7–13.3)USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell University / USDA-ARS Plant Genetic Resources Unit
Titratable acidity5.0 g/L (3.8–6.2)USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell University / USDA-ARS Plant Genetic Resources Unit
Total phenolics930.0 mg/L (900.0–960.0)USDA-ARS Plant Genetic Resources Unit, Geneva, New York, USA2017Modern analysisCornell 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

Recorded susceptibility. Pressure differs enormously by region and by season, so these are tendencies rather than predictions.
IssueSusceptibilityNote
Scabmoderate

Juice and pressing

How it is used

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.

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.

Where to go next

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.

Research Evidence standard for this record. What that means.