How to Measure a Reliable Harvest: CV, Simply
Reliability in crop statistics has one standard number: the coefficient of variation (CV). Take a decade of annual EU production, compute the standard deviation around the average, and divide by the average. A CV of 3% means a typical year lands within a few percent of the mean; a CV of 30% means buyers should plan for a range, not a number.
Measured on the EU-27 aggregate line of Eurostat dataset apro_cpsh1 over 2015-2024, the steadiest sizeable harvests are fresh tomatoes (CV 0.4%), cabbages (2.6%), cauliflower and broccoli (2.6%), beetroot (3.1%), strawberries (3.2%) and lettuces (3.5%). Each number comes from the same table, so they are directly comparable.
One methodological warning, applied consistently: the EU aggregate line is sparse for some crops. Fresh tomatoes report only 2015 and 2018 inside the window, cabbages and cauliflower only 2015-2017. Where the aggregate is thin, the CV describes the reported years only — the member-summed full decade tells a slightly different story, and this article shows both.
CV = coefficient of variation of the EU-27 aggregate annual production, 2015-2024, dataset apro_cpsh1. “Aggregate years” counts the years the EU-27 line itself reports.
| Crop | EU-27 CV 2015-2024 | Aggregate years in window | Reliability grade |
|---|---|---|---|
| Fresh tomatoes (V3110) | 0.4% | 2 | Very stable (sparse line) |
| Cabbages (V1300) | 2.6% | 3 | Very stable (sparse line) |
| Cauliflower & broccoli (V1100) | 2.6% | 3 | Very stable (sparse line) |
| Beetroot (V4300) | 3.1% | 9 | Very stable |
| Strawberries (S0000) | 3.2% | 10 | Very stable |
| Lettuces (V2300) | 3.5% | 9 | Very stable |
The Shortlist: Crops That Refuse to Swing
The three crops with a full decade of aggregate data are the honest core of the shortlist. Beetroot averaged about 799 thousand tonnes a year and moved between 754.6 thousand tonnes (2022) and 834.9 (2017) — a buyer can plan around the number. Strawberries averaged 1 188 thousand tonnes with a range of only 1 118.7 to 1 268.4, and lettuces averaged 2 327 thousand tonnes with a range of 2 243.5 to 2 443 or so at the top of the window.
Fresh tomatoes — the largest harvest on the list at about 6 540 thousand tonnes a year — are steady on the member-summed decade too: from 6 703.5 thousand tonnes in 2015 to 6 530.5 in 2024, a CV of 4.3% around the decade average. That makes the EU's single biggest vegetable harvest also one of its most predictable.
The 2024 leaders behind these steady totals are spread across the union: Spain grows the most fresh tomatoes (1 651.0 thousand tonnes), Poland the most beetroot (240.7), Spain the most lettuces (913.5). Reliability is a property of the EU total, not of one country's weather.
EU-27 production ranges over 2015-2024 (1 000 t). Fresh-tomato values are member-summed where the aggregate line is missing; the rest use the official EU-27 line.
| Steady crop | Average year (1 000 t) | Window low | Window high | 2024 (1 000 t) |
|---|---|---|---|---|
| Fresh tomatoes | 6 540 | 6 090.2 (2023) | 6 982.3 (2016) | 6 530.5 |
| Lettuces | 2 327 | 2 243.5 (2024) | 2 443.9 (2019) | 2 243.5 |
| Strawberries | 1 188 | 1 118.7 (2020) | 1 268.4 (2015) | 1 194.9 |
| Beetroot | 799 | 754.6 (2022) | 834.9 (2017) | 820.7 |
Controlled Conditions: Why the Greenhouse Share Ranks High
A visible pattern sits inside the shortlist: crops with a large protected-growing share rank highest. The EU-27 recorded 1 501.8 thousand tonnes of Spanish covered tomatoes, 828.5 Dutch and 815.3 Polish in 2024 — undercover production that does not depend on a single rainless summer or a hailstorm.
The same logic runs through the other covered crops: Spain grows 319.5 thousand tonnes of covered strawberries (the EU's covered-berry leader), Italy 189.3 thousand tonnes of covered lettuces, and Spain 743.8 thousand tonnes of covered cucumbers. The dataset records these as separate “under glass or high accessible cover” indicators, and their volume keeps the open-field totals above from swinging.
The numbers establish association, not causation: the dataset records area and volume, not growing systems beyond the covered/uncovered split. But the ordering is consistent — the EU harvests where a large share is grown under cover are the harvests that surprise buyers least.
Top two producers of “under glass or high accessible cover” crops, EU-27 2024, dataset apro_cpsh1.
| Covered crop, 2024 | Leader | Volume (1 000 t) | Second | Volume (1 000 t) |
|---|---|---|---|---|
| Covered tomatoes | Spain | 1 501.8 | Netherlands | 828.5 |
| Covered cucumbers | Spain | 743.8 | Netherlands | 416.0 |
| Covered strawberries | Spain | 319.5 | Greece | 133.9 |
| Covered lettuces | Italy | 189.3 | France | 40.8 |
Steady Is Not Growing: Trend and Swing Are Different Numbers
A low CV says the harvest does not move; it does not say where it is going. Cabbages are the clearest example: on the aggregate's three reported years the CV is just 2.6%, but the member-summed decade slides from 3 405.0 thousand tonnes in 2015 to 2 627.8 in 2024 — a decline of 22.8% spread so evenly that year-to-year steps stay small.
Beetroot shows the opposite combination: steady and growing. The member-summed harvest rose from 742.5 thousand tonnes in 2015 to 820.7 in 2024, +10.5% over the decade, with almost no violent years. Reliability plus expansion is the combination processors plan around — and the reason EU sugar beet area grew 21.7% in the same window.
For buyers and planners the rule is two numbers per crop: the CV tells you how big a buffer to hold, the decade direction tells you whether the supply base is widening or eroding. The steadiest crops on this list score well on the first number in every case.
Reliability and direction side by side, EU-27 2015-2024, dataset apro_cpsh1. Member-sum values are used where the aggregate line is incomplete.
| Crop | CV 2015-2024 | 2015 (1 000 t) | 2024 (1 000 t) | Decade direction |
|---|---|---|---|---|
| Beetroot | 3.1% | 742.5 | 820.7 | +10.5% |
| Strawberries | 3.2% | 1 268.4 | 1 194.9 | -5.8% |
| Lettuces | 3.5% | 2 332.0 | 2 243.5 | -3.8% |
| Fresh tomatoes | 0.4% (aggregate) / 4.3% (member sum) | 6 703.5 | 6 530.5 | -2.6% |
| Cabbages | 2.6% (aggregate) / 11.1% (member sum) | 3 405.0 | 2 627.8 | -22.8% |
Why Reliability Beats Records for Buyers and Planners
Record harvests make headlines; steady harvests make budgets. The mirror list in the same dataset makes the gap concrete: over the identical 2015-2024 window the EU-27 blueberry harvest swung with a CV of 31.3%, raisin grapes 30.0%, tobacco 26.1% and satsumas 23.0% — an order of magnitude above the anchors on this shortlist.
The practical difference: a buyer of beetroot plans around one number, a buyer of blueberries plans around a range and a second source. For a small retailer or processor, the steady anchors are the default shelf — predictable supply, predictable costing — while swing crops deserve contracts and buffers.
Every CV in this article can be re-checked in Eurostat dataset apro_cpsh1: filter the crop, the EU-27 and the 2015-2024 window, and the standard-deviation-over-mean calculation is one spreadsheet formula away.
The reliability pair: steadiness and volatility from the same table, EU-27 2015-2024.
| Steady anchor | CV 2015-2024 | Volatile mirror | CV 2015-2024 |
|---|---|---|---|
| Fresh tomatoes | 0.4% / 4.3% member sum | Blueberries | 31.3% |
| Beetroot | 3.1% | Raisin grapes | 30.0% |
| Strawberries | 3.2% | Tobacco | 26.1% |
| Lettuces | 3.5% | Satsumas | 23.0% |
Frequently Asked Questions
Which EU crops have the most stable harvests?
Among sizeable EU crops over 2015-2024: beetroot (EU-27 CV of 3.1%), strawberries (3.2%) and lettuces (3.5%) on the official aggregate line — with fresh tomatoes, cabbages and cauliflower similarly steady on their reported aggregate years.
How is harvest reliability measured?
With the coefficient of variation (CV): the standard deviation of a crop's annual EU production over a window, divided by its average, in percent. Lower = more reliable year to year.
Why are greenhouse vegetable harvests so stable?
Crops with a large covered-growing share rank highest: the EU-27 grew 1 501.8 thousand tonnes of covered tomatoes in 2024 (Spain alone), 743.8 of covered cucumbers and 319.5 of covered strawberries — production buffered from a single bad open-field season.
What is the steadiest large EU harvest?
Fresh tomatoes: about 6 540 thousand tonnes a year on average over 2015-2024, with a member-summed decade CV of 4.3% — the steadiest among the EU's largest vegetable harvests, and the largest harvest on this shortlist.
Source data extracted from Eurostat dataset apro_cpsh1.
This article was generated using AI. The content is based on Eurostat data and is provided as a starting point — please verify all data with the original source.
