Arbosana Olive: The Cultivar Behind Super-High-Density Groves
The arbosana olive is a small, late-ripening Catalan cultivar that most people have tasted without knowing its name. It is one of the handful of varieties compact enough to grow in super-high-density hedgerows — the narrow, machine-harvested rows that now supply a great deal of the world's everyday extra virgin olive oil. The International Olive Council's catalogue traces Arbosana to the Penedès in Catalonia and describes a tree of "reduced vigour" whose early, high and constant cropping makes it "very interesting for use in very intensive plantations" [1]. We read that datasheet, field trials from Catalonia, Córdoba and California, and newer research on water and soil on 3 October 2026. This guide explains what Arbosana is, what its oil is like by the numbers, and the honest case for and against the groves it helped to build.
For our own oil, see our Cold-Pressed Single-Estate Extra Virgin Olive Oil - Marrakech (500ml). It comes from a rain-fed Moroccan grove, not a hedgerow, and this guide is written so you can judge an Arbosana bottle on its own terms.
The Short Answer
- Arbosana is an oil cultivar of Olea europaea that the International Olive Council's catalogue says "seems to originate from Penedés (Catalonia)" [1].
- Its tree is small and slow-growing, starts cropping very early, and crops heavily and regularly — the traits that suit a hedgerow of 1,500 or more trees per hectare [1, 2].
- The clone most growers plant, Arbosana i-43, was selected in 1987 from surveys of old Arbosana trees in the Alt Penedès [2].
- In IRTA's Catalan hedgerow trial, Arbosana oil measured 73.0% oleic acid, 343 ppm total polyphenols and 12.8 hours of oxidative stability — clearly above Arbequina on all three [2].
- Its fruit ripens late — mid-January in Catalonia — and holds tightly to the branch, which the IOC notes makes trunk-shaker harvesting difficult; hedgerows are picked by over-the-row machines instead [1, 2].
- Super-high-density groves bring early yields and full mechanisation, but depend on irrigation and have raised real concerns about erosion and night harvesting [3, 6, 7, 8].
- Sidr & Stone's oil comes from a single, rain-fed estate outside Marrakech; we do not name a cultivar for it.
What the Arbosana Olive Is
Arbosana is a cultivar — a named variety of the olive tree, Olea europaea L., propagated from cuttings so that every tree is genetically the same. It is grown for oil, not for the table. The International Olive Council's World Catalogue of Olive Varieties, drawing on the work of the Spanish olive scientists Diego Barranco and Luis Rallo, records the following [1]:
| Trait | What the IOC catalogue records for Arbosana |
|---|---|
| Origin | "Seems to originate from Penedés (Catalonia)", now spreading across Spain |
| Use | Oil |
| Tree | Weak vigour, spreading habit, dense canopy |
| Fruit | Low weight, slightly elongated, medium violet when ripe |
| Cropping | High rooting capacity; very early entry into production; high and constant productivity |
| Ripening | Late, with a high fruit retention force |
| Oil content | Medium, "highly appreciated for its good organoleptic characteristics" |
| Hardiness | Cold-resistant; sensitive to olive knot (tuberculosis); resistant to peacock spot (repilo) |
The name is easy to confuse with Arbequina, its Catalan neighbour; the two are often planted side by side but differ in fruit, ripening and oil, as the trial data below show. Our guide to the Arbequina olive covers its better-known cousin.
From the Penedès to the Hedgerow: How Arbosana Was Chosen
Arbosana was an old local variety long before it was a commercial one; a clonal selection changed its fortunes. Tous, Romero, Hermoso and Ninot, of the Catalan research institute IRTA, describe in California Agriculture (2011) how "'Arbosana i-43' was selected in 1987 from surveys of the 'Arbosana' cultivar in the Alt Penedès region in Catalonia" [2]. The same paper reports six years of field data from an irrigated super-high-density planting in Catalonia, testing it alongside Arbequina i-18 and the Greek Koroneiki i-38.
The selection mattered because of the system it was being tested for. In a super-high-density (SHD) grove, trees are planted a metre or two apart in rows about four metres wide, kept as a continuous hedge and harvested by a machine that straddles the row [4, 5]. The IRTA team describe densities of 1,500 to 2,500 trees per hectare [2]. Only a short list of cultivars stays small enough to live like that, and in their table Arbosana i-43 was the least vigorous of the three — rated "very low" in vigour, with a compact canopy, early cropping and very high, regular productivity [2].
The first SHD olive groves were planted in Spain in the 1990s, largely promoted by private companies [3]. By the end of 2008, a UC Davis Olive Center survey counted 12,137 acres of SHD olives in California, of which Arbosana covered 1,687 acres — 16% — behind Arbequina at 78% and ahead of Koroneiki at 6% [4]. Arbosana is also one of the cultivars in the UC Davis Olive Center's own SHD orchard, planted in 2019 and 2020 at 1.5 m by 4.2 m, about 622 trees per acre [5].
Does Arbosana Hold Up Over Time? The 14-Year Córdoba Trial
An early worry about hedgerows was that crowded trees would decline after seven or eight years. The best long-term evidence says otherwise. Díez and colleagues (Frontiers in Plant Science, 2016) followed Arbequina, Arbequina IRTA-i·18, Arbosana, Fs-17 and Koroneiki for 14 years at Pedro Abad, near Córdoba in southern Spain, at 1,975 trees per hectare [3].
- Average fruit yield for Arbequina, Arbequina i-18, Arbosana and Koroneiki ranged from 12.2 to 14.2 tonnes per hectare per year, with no significant difference between them [3].
- Average oil production across the cultivars that suited the system was 2.3 tonnes per hectare per year; only Fs-17 fell short, at roughly half [3].
- Accumulated production rose in a straight line, and the hedgerows were "still fully productive" after 14 years [3].
One detail matters for what follows. The Córdoba trial was drip-irrigated from May to September at about 2,000 cubic metres of water per hectare per year [3]. Its results describe an irrigated hedgerow, not a dry-farmed one.
What Arbosana Oil Is Like, by the Numbers
Arbosana oil is generally described as greener and more bitter than Arbequina. The IRTA trial put figures on that [2]:
| Measure (IRTA trial, Catalonia) | Arbequina i-18 | Arbosana i-43 | Koroneiki i-38 |
|---|---|---|---|
| Oleic acid | 69.4% | 73.0% | 76.6% |
| Palmitic acid | 14.5% | 13.6% | 11.4% |
| Linoleic acid | 11.1% | 7.9% | 6.89% |
| Total polyphenols | 234 ppm | 343 ppm | 400 ppm |
| Oxidative stability (Rancimat) | 9.10 hours | 12.8 hours | 15.23 hours |
| Harvest season | Early to mid-season | Late | Mid-season |
Read across a row and Arbosana sits between the soft Catalan oil and the robust Greek one on every measure — our guide to Koroneiki olive oil covers the latter. The IRTA authors describe its oil as "intense, green-fruited" with "high levels of bitterness, spiciness and astringency", and they draw the practical conclusion themselves: "due to its higher polyphenol content, it is particularly interesting for blending and to stabilize and prolong the shelf life" of milder Arbequina oil [2]. That is how many hedgerow producers use it — as the backbone of a blend rather than always as a single-variety oil.
Two cautions apply. These figures come from one trial in one region, and polyphenols move a great deal with harvest timing, milling and storage. A figure in a research table is not a figure on any particular bottle. Our explainer on olive oil polyphenols explains how they are measured and why bottles of the same variety differ so much.
The Case For Super-High-Density Groves
Arbosana's story is inseparable from the hedgerow, so the system deserves a fair hearing. Its advantages are real and well documented:
- Early crops. SHD orchards "enable early entry into production and full mechanization", as a 2026 study of an Arbosana hedgerow in Argentina puts it [6].
- Steady long-term yields. The Córdoba hedgerows were still fully productive after 14 years [3].
- Fast picking. An over-the-row harvester clears a hedge quickly, helping a mill press fruit soon after picking.
- Water can be cut. In the Argentine Arbosana trial, continuous deficit irrigation at 70% of crop water demand saved about 30% of irrigation water and sustained, then raised, fruit and oil yield over three seasons [6].
A carefully milled Arbosana from a well-run hedge can be an excellent extra virgin olive oil.
The Case Against: Water, Soil and Birds
The criticisms are also real, and they are not about taste.
Water
The same Argentine study states plainly that SHD systems "require high-water supply and they do not tolerate prolonged water stress" [6]. The Córdoba trial applied about 2,000 cubic metres per hectare a year [3], and the 25 California growers who answered the UC Davis survey's water question used an average of 21 inches a year [4]. A traditional rain-fed grove, by definition, takes only what falls from the sky. Where water is scarce, that difference is the heart of the debate.
Soil
Gristina, Barone and Scalenghe (PLoS One, 2026) measured erosion in a six-year-old SHD grove on a 15.6% slope in south-west Sicily. They found mean losses of 29.4 tonnes of soil per hectare per year — comparable to vineyards and "markedly higher than rates reported for traditional olive systems" — with about 62% of the ground left bare between the hedges [7]. It is a single site, and the authors suggest cover crops, mulching and contour management as remedies.
Birds
Night-time machine harvesting became a scandal in Spain. The Convention on Migratory Species reported in October 2019 that a 2018 Andalusian government report estimated "approximately 2,600,000 birds could be killed due to night-harvesting techniques every year in Spain alone", because the machines' bright lights confuse roosting birds; night harvesting was suspended for the 2019–2020 season [8]. That is a problem of practice rather than of the cultivar — but it is a problem the hedgerow model created.
Arbosana Hedgerows and Traditional Groves Compared
The fairest comparison is not "good versus bad" but two different systems with different costs:
| Super-high-density Arbosana hedgerow | Traditional rain-fed grove | |
|---|---|---|
| Planting | Roughly 1,500–2,500 trees per hectare in continuous hedges [2] | Widely spaced individual trees |
| Water | Irrigation required; does not tolerate prolonged drought [6] | Rainfall only |
| Harvest | Over-the-row machine | By hand, with nets, or with trunk shakers |
| First crops | Very early [1, 6] | Typically later |
| Main concerns | Water use, erosion on slopes, night harvesting [6, 7, 8] | Typically lower yields per hectare; more labour at harvest |
Our own oil comes from a single, family-owned, rain-fed estate on the plains outside Marrakech. That is a description of how our trees are grown, not a claim that the oil is better than a good Arbosana — it is a different way of farming with different trade-offs. For the wider argument, see our guide to single-estate olive oil.
How to Choose an Arbosana Olive Oil
"Arbosana" on a label tells you which plant the fruit came from. These checks tell you the rest:
- "Extra virgin" stated plainly — see our guide to what extra virgin actually means.
- Single-variety or blend — "100% Arbosana" will taste greener and more bitter than an Arbequina-led blend.
- A harvest date, not only a best-before date.
- Dark glass or a tin, in a size you will finish within a few months of opening.
For the same checks applied to any bottle, see our guide to choosing a quality olive oil.
The Honest Objections
"Isn't hedgerow oil just industrial oil?"
No. Scale does not decide quality; the time between picking and milling, and the care taken afterwards, matter far more. The legitimate concerns are environmental — water, soil and birds — not that the oil itself must be poor.
"You sell a traditional Moroccan oil — aren't you biased against hedgerows?"
We have an interest, so we have kept to published sources and given the hedgerow case its due. We have not grown Arbosana ourselves; everything about the cultivar comes from the sources listed. A fresh, well-made Arbosana is a very good oil.
Why Sidr & Stone
A cultivar name is only the start of the story; how and where the trees are farmed tells you the rest. Sidr & Stone's Cold-Pressed Single-Estate Extra Virgin Olive Oil - Marrakech (500ml) is specific about both.
- Single-estate — Sidr & Stone's olive oil comes from our own family-owned farm near Marrakech, Morocco, and we control every step from tree to bottle, with no blending across origins.
- Rain-fed — our trees are not irrigated; they take what the season gives.
- Organically grown — no synthetic fertilisers, pesticides or herbicides are used (not yet certified; certification is in progress).
- Single harvest — a small, limited batch, picked when the fruit is ready; the current batch's harvest details are on the product page.
- Cold-pressed within hours of harvest — mechanical extraction only, with no solvents, no refining and no deodorising.
- Unfiltered extra virgin — minimally processed, so it may show natural sediment, which is normal.
- 100% natural — a single ingredient, olive oil, with nothing blended in.
- Dark glass with a gold label — protective packaging against light.
- 10% of profits to charity — a brand-wide commitment.
- Fulfilment in the UK, EU, and US.
We will not tell you Sidr & Stone is better than a good Arbosana — and we do not yet publish polyphenol or stability figures for our oil, so we will not set ours against the trial numbers above. What we will say is that our oil is single-estate Moroccan, rain-fed, organically grown and cold-pressed within hours of harvest. For more on our origin, see our guide to Moroccan olive oil.
Frequently Asked Questions
What is an Arbosana olive?
Arbosana is an oil cultivar of the olive tree that the International Olive Council's catalogue traces to the Penedès in Catalonia, Spain. Its small, slow-growing tree crops early and heavily, which is why it is one of the main varieties in super-high-density hedgerow groves.
Why is Arbosana used in super-high-density groves?
Because the tree stays small. The IRTA trial rated Arbosana i-43 "very low" in vigour with a compact canopy, early cropping and very high, regular productivity — the traits a continuous, machine-harvested hedge needs.
What does Arbosana olive oil taste like?
Greener and more bitter than Arbequina. Researchers at IRTA described it as intense and green-fruited, with high bitterness, spiciness and astringency, and noted it is often blended with milder Arbequina.
What is the difference between Arbosana and Arbequina?
Both are Catalan cultivars suited to hedgerows, but Arbosana ripens later and, in the IRTA trial, gave oil with more oleic acid (73.0% vs 69.4%), more polyphenols (343 vs 234 ppm) and longer stability (12.8 vs 9.10 hours).
Is Sidr & Stone's olive oil made from Arbosana?
We do not name a cultivar for our oil, so we do not claim one. It comes from a single, rain-fed, family-owned estate on the plains outside Marrakech, Morocco — a traditional grove rather than a hedgerow.
Are super-high-density olive groves bad for the environment?
They have real costs — irrigation, high erosion measured on a sloping Sicilian hedgerow, and bird deaths from night harvesting in Spain — alongside early, steady yields and evidence that irrigation can be cut substantially.
Where can I buy a single-estate extra virgin olive oil?
Look for a producer that names one farm and sells only extra virgin. Our Cold-Pressed Single-Estate Extra Virgin Olive Oil - Marrakech (500ml) is available to pre-order from the current single-harvest batch, with fulfilment in the UK, EU, and US.
Is olive oil a medicine?
No. Olive oil is a food, not a medicine. It has a long traditional history — including being honoured in the Prophetic Sunnah — and a substantial body of modern research, particularly around polyphenols, cardiovascular health, and the Mediterranean diet pattern. It can be a worthwhile part of a healthy routine, but it does not cure diseases and is not a substitute for medical care. Be cautious of any olive oil marketed with specific disease-cure claims.
Final Thoughts
Arbosana is a small Catalan tree that found a large role. Its reduced vigour, early cropping and steady yields made it one of the few cultivars that thrive in a super-high-density hedge, and its greener, more bitter oil gives hedgerow blends backbone and shelf life.
The groves it helped to build are neither villains nor miracles: they crop early and reliably, but depend on irrigation and, badly managed, cost soil and wildlife. Read an Arbosana label with that in mind — the variety, then the grower, the harvest date and how the trees were farmed.
Our Cold-Pressed Single-Estate Extra Virgin Olive Oil - Marrakech (500ml) — single-estate, rain-fed and cold-pressed within hours of harvest — is available to pre-order now as a limited single-harvest batch, with fulfilment in the UK, EU, and US.
Our extra virgin olive oil is grown organically on our own single-estate farm on the plains outside Marrakech: we control every step from tree to bottle, and no synthetic pesticides, herbicides or fertilisers are used. It is not yet certified organic — certification is in progress, and we will publish it as soon as it comes through.
References
- International Olive Council. World Catalogue of Olive Varieties: Arbosana (Spain; datasheet after Barranco D, Rallo L, 2005). Accessed 3 October 2026. https://worldolivecatalogue.internationaloliveoil.org/pdf/100
- Tous J, Romero A, Hermoso JF, Ninot A. Mediterranean clonal selections evaluated for modern hedgerow olive oil production in Spain. California Agriculture. 2011;65(1):34-40. doi:10.3733/ca.v065n01p34.
- Díez CM, Moral J, Cabello D, Morello P, Rallo L, Barranco D. Cultivar and Tree Density As Key Factors in the Long-Term Performance of Super High-Density Olive Orchards. Front Plant Sci. 2016;7:1226. doi:10.3389/fpls.2016.01226. PMID: 27602035.
- Sturzenberger ND. Survey: Super-High-Density Olive Production in California. UC Davis Olive Center; November 2009. Accessed 3 October 2026. https://olivecenter.ucdavis.edu/sites/g/files/dgvnsk14776/files/media/documents/survey111509revised.pdf
- UC Davis Olive Center. Our Orchards. Accessed 3 October 2026. https://olivecenter.ucdavis.edu/about/orchards
- Gentili L, Tivani M, Mastio V, Capraro F, Contreras C, Torres M, Maestri D, Pierantozzi P. Deficit irrigation in a young, super high-density hedgerow olive orchard (cv. Arbosana): effects on physiological, vegetative, and productive parameters. Front Plant Sci. 2026;17:1814138. doi:10.3389/fpls.2026.1814138. PMID: 42368539.
- Gristina L, Barone E, Scalenghe R. Olive orchard intensification compromises soil water erosion control in a semi-arid environment. PLoS One. 2026;21(4):e0346675. doi:10.1371/journal.pone.0346675. PMID: 42060598.
- Convention on the Conservation of Migratory Species of Wild Animals (CMS). Spain Undertakes Important Step to Prevent Illegal Killing of Migratory Birds. 30 October 2019. Accessed 3 October 2026. https://www.cms.int/fr/node/8845
Disclaimer: This article describes the Arbosana olive cultivar and super-high-density olive growing using International Olive Council, University of California, intergovernmental and peer-reviewed sources as they stood on 3 October 2026; research findings, standards and agricultural practice may change, and readers should check current sources. Comparisons between growing systems and cultivars are made in good faith and in fair terms. Olive oil is a food, not a medicine, and is not a substitute for medical treatment of any condition. For any health concern, consult a qualified medical professional.