Orchards

Tree age and juice quality

Does the age of the tree change the juice?

In short

In perry pears it does, and it is documented. The compiler of the Long Ashton perry pear analyses attached a warning to the whole table: juice quality improves markedly with tree age, and young trees give weaker acid, weaker tannin and a much lower specific gravity.

For two varieties the station published both figures. Barland from young trees measured 1.038 gravity and 0.26 per cent tannin; from old trees, 1.058 and 2.6 per cent tannin. Green Longdon went from 1.6 grams per litre of acid on young trees to 4.8 on old ones.

The effect is much less discussed in cider apples, and CiderHQ has found no equivalent published pairing for one. That is a gap in the evidence rather than evidence of absence.

Eight perry pear varieties measured in the Three Counties. The solid bars are assimilable nitrogen; the dashed bars are proline, which yeast cannot take up without oxygen. They do not move together.

Described in full

Shape: Eight named rows, each with two horizontal bars. The solid bar on the left is free amino nitrogen in milligrams of nitrogen per litre, on a scale to 80. The dashed bar on the right is proline in milligrams per litre, on a wider scale to 360. Each bar carries its figure as a number beside it.
The figures: Green Roller 70.6 and 133.4; Felix 69.7 and 164.3; Betty Prosser 49.2 and 269.9; Barland 24.8 and 145.6; Butt 13.3 and 17.9; Moorcroft 6.3 and 123.1; Red Pear 3.7 and 42.8; Tumper 1.0 and 337.2. All are single samples from a survey of Three Counties fruit taken between 2022 and 2024.
Why proline is separated: Proline is an amino acid, and any measurement of total amino acids counts it. A yeast fermenting anaerobically cannot assimilate it, because the enzyme that opens the proline ring requires molecular oxygen. So a juice can be rich in amino acids and starved of usable nitrogen at the same time.
Tumper: The extreme case, and the reason the figure exists. One milligram per litre of usable nitrogen beside 337 of proline — a ratio of more than three hundred to one. A total amino acid figure would describe that juice as well supplied. It is not, and a ferment on it alone has effectively nothing to eat.
The two do not track: Butt is low in both. Moorcroft is low in one and high in the other. Green Roller is high in both. There is no relationship visible here that would let a maker infer one figure from the other, which is why the survey reports them separately and why this figure does.
Scope: Eight varieties out of thirty-eight surveyed, chosen to span the range rather than sampled at random. Every figure is one juice from one collection in one autumn: the same survey found the same variety differing markedly between years and between tree types.

What the Long Ashton figures actually show

The Barland pairing is the striking one: a tenfold difference in tannin and a twentyfold difference in gravity units between juice from young and old trees of the same variety on the same station. If those two figures arrived without their labels they would be read as two different cultivars.

The Brandy row shows the effect is not uniform. Its gravity rises with age as the others do, and its acid falls rather than rising. Whatever is happening is not a single mechanism operating in one direction on every property.

Long Ashton perry pear analyses where the station published young-tree and old-tree figures separately.
Variety	Young trees	Old trees
Barland	SG 1.038, acid 3.8 g/L, tannin 0.26 g/L	SG 1.058, acid 9.2 g/L, tannin 2.6 g/L
Brandy	SG 1.046, acid 1.4 g/L	SG 1.069, acid 0.4 g/L
Green Longdon	SG 1.040, acid 1.6 g/L, tannin 0.6 g/L	SG 1.057, acid 4.8 g/L, tannin 1.9 g/L

What the modern survey adds

A Three Counties survey of perry pear juice run between 2022 and 2024 sampled several varieties more than once, and where it sampled the same variety from different tree types the differences are large. Hendre Huffcap from bush trees measured 3.0 grams per litre of acid and 460 milligrams per litre of total phenolics; Hendre Huffcap from standard trees, in the same month of the same year, measured 8.4 grams per litre of acid and 1 140 milligrams per litre of phenolics.

Bush trees and standard trees are not simply young and old — a bush tree on a dwarfing rootstock will never become a standard — but the direction agrees with what Long Ashton reported, and the size of the difference is comparable.

The survey also found large differences between seasons on what may have been the same trees. Oldfield measured 690 milligrams per litre of true tannin in 2022 and 3 000 in 2024. Whatever share of that belongs to tree age, a good deal of it does not.

Why it might happen

Root system and water relations. An old standard on a vigorous rootstock draws from a much larger soil volume, and juice concentration depends on how much water the fruit has diluted its solutes with.
Crop load per unit of leaf area. A young tree carrying its first crops is putting a large share of its resources into wood; a mature tree is not, and the fruit gets a different share.
Fruit size. Smaller fruit has a higher skin-to-flesh ratio, and phenolic material is concentrated near the skin. A tree cropping heavily with small fruit gives more phenolic per litre than the same tree cropping lightly with large fruit.
Which of these dominates is not established by anything CiderHQ has read, and the sources that record the effect do not attempt to explain it.

What it means for reading any perry pear figure

Every historic perry pear analysis on this site carries a caveat naming this problem, because the compiler of those figures thought it important enough to attach to the whole table and because the effect is large enough to matter more than the difference between many varieties.

It also affects how a new orchard should be read. A grower planting perry pears will get juice for years before getting the juice the variety is known for, and a bench trial run on fruit from young trees is not a trial of the variety.

And it is a reason the traditional standard perry pear orchard is not merely picturesque. A pear tree that takes thirty years to come into full bearing and then crops for two centuries is producing its characteristic juice for most of a very long life; the same variety in a modern bush planting may be replaced before it ever gets there.

What is not knownNo source CiderHQ has reached publishes a young-tree and old-tree pairing for a cider apple. Whether the effect is as strong in apples as in pears is genuinely open, and the silence in the apple literature should not be read either way.

Also answered on this page

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

Do older apple trees make better cider?
Why do perry pears take so long to come into bearing?
Does tree age affect juice quality?
Is juice from young trees weaker?

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 does a rootstock actually do, and what do the m numbers mean — Every named apple cultivar is propagated by grafting a shoot of it onto the root system of a different tree. That root system, the rootstock, controls vigour and therefore final tree size, how quickly the tree comes into bearing, how long it will live, how well it anchors itself, and how it tolerates waterlogging and certain soil-borne diseases.
What is the difference between perry and cider — Perry is fermented pear juice and cider is fermented apple juice, and four chemical differences follow: pear juice carries sorbitol that will not ferment, citric acid that apple juice lacks, much less usable nitrogen, and tannin that reads as drying grip rather than as bitterness.
What is a bush orchard and what changed when cider growers started planting them
When are cider apples harvested — In the northern hemisphere the cider harvest runs from about September to November, with late bittersweets such as Dabinett and Vilberie coming in last. Cider fruit is generally picked riper than dessert fruit, and often gathered from the ground.
How long before a cider apple tree bears fruit — A bush tree on a semi-dwarfing stock may give a useful crop in four to six years; a standard tree on vigorous stock can take a decade or more, and then crops for a century.
What happened to britain’s old orchards — A large majority of traditional standard orchards were lost during the twentieth century, grubbed up for arable land, replanted as bush orchards, or simply left to fall over. The remaining ones are recognised as a priority habitat.

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.

Perry Pear Varieties from Long Ashton (NACM Short Report 8.2)
National Association of Cider Makers, Archive of Cider Pomology · research institute · passage verified 2026-08-25 · covers 1903–1963
A four-page compilation, dated March 2010, of the Long Ashton perry pear varieties: for each of twenty pears, its vigour, cropping habit, maturity window, specific gravity, acidity, tannin and an assessment of vintage quality. It rests on Luckwill and Pollard’s Perry Pears (1963), which CiderHQ has verified bibliographically and has not opened, so the figures are held at traditional-record tier rather than at research tier despite originating in institutional analysis. This is the report that ended a two-sprint gap: before it, no perry pear page on the site carried a cultivar-specific number.
Perry Pears and Perry — Research and Survey Work
Cider and Perry Academy (Peter Mitchell) · specialist publication · passage verified 2026-08-25 · covers 2022–2024
Ongoing survey work by a cider and perry technologist who has taught production for decades, published openly and updated annually; retrieved and read in full on 2026-08-25. Thirty-eight single-variety perry pear juices analysed for gravity, titratable acidity, the tannin and phenolic acid fractions separately, and the individual amino acids by HPLC — the last of which nobody else has done at this scale for perry. Not peer-reviewed, and the author is explicit that the accompanying fermentation trials are initial surveys needing statistical treatment before differences are called significant; CiderHQ repeats that wherever the fermentation results are used.
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.
The Archive of Cider Pomology
Hereford Cider Museum Trust / National Association of Cider Makers · historical source · retrieved 2026-08-25 · covers 1989–2012
The single most useful discovery of Mega Sprint 4. When the Ministry closed Long Ashton’s cider work, the National Association of Cider Makers took over cider pomology research; the resulting archive is held at the Hereford Cider Museum and publishes some seventy-five research reports openly, including compilations of Long Ashton material that had otherwise reached the present only through books. It is the route by which CiderHQ finally obtained per-cultivar perry pear figures, having failed to reach the 1963 volume they originate in.

Where to go next

Cider orchards — The rest of the orchard material, grouped by what you want to know.
Cider apples — The cultivars themselves, with vigour, pollination group and harvest window.
How cider is made — What happens to the fruit once it leaves the orchard.