Leccino Olives: The Cultivar, the Catalogue and What the Name Commits To
Leccino olives turn up in two quite different places, and the two do not agree with one another. In a deli they are a tub of mild, dark Italian table olives sold on the strength of the word Tuscan. In the industry's own reference work — the International Olive Council's World Catalogue of Olive Varieties — Leccino is filed under a single stated purpose, and that purpose is oil. Somewhere between those two facts stands a shopper holding a tub and wondering whether the name on it means anything at all. This article sets out what the catalogue records about Leccino, what the European register does and does not protect, and what the word commits a producer to when it is printed on a pack.
For our own oil, see our cold-pressed organic Marrakech olive oil. We do not sell table olives, and nothing in this article is trying to sell you any.
The Short Answer
- Leccino is an Italian olive cultivar, not a place and not a designation. The IOC World Catalogue of Olive Varieties lists it under Italy, records its genetic origin as unknown, and describes it as very close to the cultivar Frantoio and highly widespread in Tuscany.
- The catalogue files it for one purpose: oil. That is the entry's own single-word answer under Purpose, even though a great deal of what is sold in Britain as Leccino olives is brined table fruit.
- The name is not protected anywhere in the European register. We pulled the full eAmbrosia register — 4,014 entries — on 2 September 2026 and filtered it. Not one registered name contains the word Leccino.
- The designation most Tuscan oil is sold under does not mention it either. We fetched and read the English application sheet behind Toscano PGI, file number PGI-IT-1512. It sets acidity, peroxide value, aroma and a panel score. It names no cultivar at all.
- The catalogue is candid about the oil. It records a medium oil yield of about 18%, oleic acid at about 76%, and a low content of total phenols unless the fruit is harvested early — concluding that the characteristics "correspond to a medium quality oil".
- It is tolerant of Xylella, not immune to it. The 2016 BMC Genomics paper that put Leccino on the map found infected trees showed much milder symptoms than the highly susceptible Ogliarola salentina. Milder is not the same as unaffected.
- The variety name on a tub of olives is optional. Codex standard CXS 66-1981 requires the type, the trade preparation, the style and the size near the product name. The variety and the trade category are both listed as optional.
- Sidr & Stone sells olive oil, not olives. What carries across is the habit: read the register and the specification, not the adjective on the front of the pack.
What a Leccino Olive Actually Is
Leccino is a cultivar of Olea europaea L., the single olive species. Kew's Plants of the World Online carries that name as accepted under the family Oleaceae, published by Linnaeus in Species Plantarum in 1753, with seven accepted subspecies beneath it and no cultivars listed at all. That last point is worth sitting with: cultivar names such as Leccino are not botanical taxa. They are horticultural names for clonally propagated selections, and the register that governs them is an agricultural catalogue rather than a botanical one.
The IOC World Catalogue of Olive Varieties is that catalogue. Its Leccino entry describes a tree of strong vigour with a spreading habit and a dense canopy, bearing fruit of medium weight, moderately elongated, strongly asymmetric, rounded at the apex, with the nipple absent or weak, and black at full maturity. On origin it is unusually frank: genetic origin unknown. It records the variety as very close to the cultivar Frantoio and highly widespread in Tuscany and other Italian regions, recently introduced to Umbria and Apulia and to newer olive-growing countries. For the neighbouring cultivar, see our guide to Frantoio olive oil.
Like every olive it is inedible off the tree — the bitterness is oleuropein, and removing it is the entire point of curing, a process our piece on olives and oil covers in general terms.
Seven Names for One Tree
The first practical thing the catalogue tells you is that Leccino does not travel under one name. Its entry lists seven synonyms — Leccio, Leccino di Belmonte, Premice, Premice Silvestrone, Silvestrone, Toscano and Verolana. A grower in one valley and a nurseryman in the next can be selling the same clone under different words, which is exactly the situation cultivar catalogues exist to sort out.
One of those synonyms causes real trouble. Toscano is simultaneously a synonym for the Leccino cultivar, a registered olive oil PGI, and a registered wine PGI. Those are three different things with three different legal weights, and only one of them is a variety.
| The word | What it is | Register entry | What it commits anyone to |
|---|---|---|---|
| Leccino | A cultivar name | IOC World Catalogue of Olive Varieties, Italy | Nothing legally. No EU registered name contains it |
| Toscano (as a synonym) | One of seven catalogue synonyms for Leccino | Same catalogue entry | Nothing. It is a naming variant, not a claim |
| Toscano (the oil PGI) | A protected geographical indication for extra virgin olive oil | PGI-IT-1512, registered 21 March 1998, Official Journal L 87 | Origin in Tuscany plus the chemical and sensory specification |
| Toscano / Toscana (the wine PGI) | A protected geographical indication for wine | PGI-IT-A1517, registered 19 February 1999 | Nothing about olives. A different product category entirely |
| Leccio, Premice, Silvestrone, Verolana | Further catalogue synonyms | Same catalogue entry | Nothing. Useful only for identifying the clone |
All of those register entries were shown as registered, with no removal flag, on the day we checked. The point of the table is not that anyone is being dishonest. It is that four of the five rows commit a producer to nothing whatsoever, and only one of them is the row a shopper is usually looking at.
An Oil Variety Sold as a Table Olive
Here is the discrepancy that started this article. Search for Leccino olives in Britain and most of what comes back is table fruit — whole black olives, pitted olives, olives held in brine for months and sold by the tub for pizza and antipasti. Search the IOC catalogue for the same word and the field marked Purpose contains one entry: Oil.
Both things are true at once, and neither is a scandal. A cultivar bred and selected for milling can perfectly well be brined and eaten, and Leccino's medium-weight, firm, moderately elongated fruit takes a cure well. But the catalogue's classification is a statement about what the variety is agronomically optimised for, and it is not the claim the tub is making. The tub is making a flavour claim. The catalogue is making a production one.
What the catalogue does record about the oil is more useful than most retail copy, and considerably less flattering.
| What the catalogue records | The entry for Leccino |
|---|---|
| Stated purpose | Oil |
| Oil yield | Medium, approximately 18% |
| Oleic acid content | High, approximately 76% |
| Total phenols | Low, unless the fruit is harvested early |
| Overall assessment | Sensorial and compositional characteristics correspond to a medium quality oil |
| Pollination | Totally self-sterile; ovary abortion approximately 0.8% |
| Harvest | Medium-low fruit detachment force, which suits mechanical harvesting |
| Disease profile | Moderately tolerant of cold and of Verticillium dahliae; low susceptibility to olive knot and leaf spot; moderately susceptible to olive fruit fly |
Two entries there deserve attention. Totally self-sterile means a Leccino grove cannot set fruit on its own and needs a pollinating partner, which is why Leccino and Frantoio so often appear in the same field. And low total phenols unless early harvested puts the decisive variable where it actually sits: not in the cultivar name, but in the date the fruit came off the tree.
What the Toscano PGI Specification Actually Says
If Leccino is not itself protected, the reasonable next question is whether it is named inside the designations under which Tuscan oil is sold. So we went and looked.
Italy holds 50 registered geographical indications for oils and fats in the European register. Among them are Toscano PGI (PGI-IT-1512, 21 March 1998), Chianti Classico PDO (PDO-IT-0108, 31 March 2000), Terre di Siena PDO (PDO-IT-0109, 1 October 1999), Lucca PDO (PDO-IT-0199, 31 December 2003) and Umbria PDO (PDO-IT-1520, 25 November 1997). All were shown as registered, with no removal flag, when we checked.
Only one of those carries an English-language document on eAmbrosia, and we fetched and read it: the application for registration behind Toscano PGI, filed by CROEVOTT, the Consorzio regionale olio toscano, from Bibbona in the province of Livorno. It is a short document and it is worth knowing what is in it, because it is not what most people assume.
It defines the product as extra virgin olive oil with a maximum acidity of 0.6% — stricter than the 0.8% ceiling that defines extra virgin generally — a peroxide number no greater than 16.00 milliequivalents of oxygen per kilogramme, a colour running from green to golden yellow and varying with time, a fruity smell with an aroma of almonds, artichokes, ripe fruit and green leaves, a marked fruity flavour, and a minimum panel test score of 6.5. It draws the geographical area as the entire administrative territory of the region of Tuscany. It requires the olives to be harvested by a date fixed in advance each year by the region, that date being 30 January, with the maximum yield per hectare set annually on the basis of surveys. It permits extraction by mechanical processes only. Its labelling requirement is three words: olio extra vergine di oliva Toscano.
What it does not contain, anywhere, is the name of a single cultivar. Not Leccino, not Frantoio, not Moraiolo. The designation regulates acidity, oxidation, aroma, taste, harvest date, yield and extraction method. Variety is left entirely to the grower. For the wider picture of which Italian olive names the register genuinely protects, see our guide to Italian olives.
Xylella, and the Difference Between Tolerant and Resistant
Leccino's second life as a famous name has nothing to do with flavour. In 2013 Xylella fastidiosa subsp. pauca was found in olive groves in Apulia, causing what became known as Olive Quick Decline Syndrome, and field observers noticed that Leccino trees were faring conspicuously better than their neighbours.
The paper that established this is Giampetruzzi and colleagues, published in BMC Genomics in 2016 under the title "Transcriptome profiling of two olive cultivars in response to infection by the CoDiRO strain of Xylella fastidiosa subsp. pauca" (doi 10.1186/s12864-016-2833-9, PMID 27350531). Its own framing is careful and worth quoting in substance rather than paraphrasing loosely: field observations disclosed that infected plants of cv. Leccino show much milder symptoms than the more widely grown and highly susceptible cv. Ogliarola salentina, and the study set out to determine whether those observations underlay a tolerant condition in Leccino.
Tolerant is the operative word. A tolerant tree is still infected. It carries the bacterium, it can host the insect vector, and it shows symptoms — just less severely. A good deal of the copy written about Leccino since has quietly upgraded that finding to resistant, which is a materially different claim and not one the paper makes. It is also not a claim the IOC catalogue makes: its disease notes for Leccino cover cold, Verticillium dahliae, olive knot, leaf spot and olive fruit fly, and do not mention Xylella at all.
Reading a Tub of Leccino Olives
Section 8 of Codex standard CXS 66-1981, the international standard for table olives, sets out what belongs on a retail pack. Four things must appear as part of the product name or close to it: the type, the trade preparation, the style and the size. Two things are explicitly listed as optional — the trade category, and the name of the variety.
Leccino is in the optional column. It is there because a producer chose to put it there, and its presence is not audited by the standard.
| On the tub | Required or optional | What it actually tells you |
|---|---|---|
| "Leccino" | Optional under CXS 66-1981 | A varietal name with no register behind it. Unverified by the standard |
| Trade preparation | Required | Natural, treated, dehydrated or darkened by oxidation — a real processing claim |
| Type | Required | Green, colour-turning or black, according to ripeness at harvest |
| Style and size | Required | Whole, cracked, stoned or stuffed; graded by count per kilogramme |
| Brine strength and acidity | Set by the standard, not printed | Natural olives in brine must reach at least 6.0% sodium chloride and no more than pH 4.3 |
| Drained weight | Set by the standard | At least 50% for whole olives and 40% for stoned or stuffed ones |
The same logic runs on the oil shelf, where grades are governed by the International Olive Council trade standard, currently Revision 22 of June 2026. Grade is audited. Variety, in most cases, is not. Our piece on Taggiasca olives follows the identical pattern with a different Italian name, and our guide to Kalamata olives shows what the exception looks like when a fruit does hold a designation of its own.
The Objections Worth Taking Seriously
"Calling it a medium quality oil is unfair — an early-harvest Leccino can be excellent." That is right, and the catalogue itself supplies the reason: phenols are low unless the fruit is harvested early. A grower who picks in October rather than December is making a different oil from the same trees. The honest reading is not that Leccino is a poor cultivar but that the cultivar name is a weak predictor of what is in the bottle, and harvest timing is a strong one. That is an argument against buying by variety name, not against the variety.
"Leccino is Xylella-resistant, and that is a genuinely important thing." It is important, and it is also not resistance. The published finding is milder symptoms and a tolerant condition, in a tree that still becomes infected. Overstating it has a real cost: a grower who plants Leccino believing the problem is solved has bought something the evidence does not offer.
"You sell olive oil, so of course you say variety names do not mean much." Fair, and we should be plain about it. We do not publish a cultivar claim for our own oil either, and we do not publish a polyphenol figure for it, because we have not had it tested. We are not asking you to trade a Tuscan variety name for a Moroccan one. We are saying that the checkable things on a bottle are grade, origin, harvest and date, and that we would rather be judged on those.
Why Sidr & Stone
We came to this the way we come to most of these pieces: a name that appears everywhere, a register that can be pulled in an afternoon, and a gap between the two. That is the whole of our claim to authority here. We read the primary documents, we say plainly which ones we could not read, and we report what we found rather than what would be convenient. Our own product is oil, and it is deliberately unexciting in composition.
- Single-estate — one family-owned grove on the plains outside Marrakech, Morocco, with no blending across origins.
- Rain-fed — no irrigation; the trees take what the season gives them.
- Organically grown — no synthetic fertilisers, pesticides or herbicides. We do not hold a formal organic certificate and we do not claim one.
- Single harvest — a small batch, once a season, picked when the fruit is ready rather than when the calendar says so.
- Cold-pressed within hours of harvest — flavour, aroma and polyphenols preserved by keeping the gap between picking and pressing short.
- Unfiltered extra virgin — minimally processed, and it may show natural sediment, which is normal for an unfiltered oil.
- 100% natural — one ingredient, and nothing added to it.
- 500 ml dark glass with a gold label — protective packaging in a size built to be finished fresh.
- Halal certified, with 10% of profits to charity as a brand-wide commitment.
- Fulfilment in the UK, EU, and US.
We will not tell you Sidr & Stone is the best olive oil — that would be exactly the kind of unbacked adjective this article is about. We publish no polyphenol figure for our oil, and we would rather say so plainly than imply one. What we will say is that it is single-estate Moroccan, rain-fed, organically grown and cold-pressed within hours of harvest, and that those are things a grower can be held to.
Frequently Asked Questions
What are Leccino olives?
Leccino olives are the fruit of an Italian cultivar of Olea europaea, most widespread in Tuscany and closely related to Frantoio. The IOC World Catalogue of Olive Varieties records the fruit as medium-weight, moderately elongated, strongly asymmetric and black at full maturity, and files the variety under a single purpose: oil.
Are Leccino olives good for eating?
They are widely sold as brined table olives and take a cure well, with a mild, mellow character rather than a sharp one. It is worth knowing that the variety is catalogued as an oil cultivar, so a table olive sold under the name is a use of the fruit rather than the use it was selected for.
What does Leccino olive oil taste like?
Mild and low in bitterness, which follows directly from the catalogue's own note that total phenols are low unless the fruit is harvested early. The same entry records oleic acid at about 76% and concludes that the sensorial and compositional characteristics correspond to a medium quality oil. An early-harvest Leccino is a different proposition from a late-harvest one.
Is Leccino the same as Frantoio?
No, but they are close. The IOC catalogue describes Leccino as a variety very close to the cultivar Frantoio, and the two are frequently planted together because Leccino is totally self-sterile and needs a pollinator. They are separate entries in the catalogue with separate synonym lists.
Are Leccino olive trees resistant to Xylella?
Tolerant rather than resistant. Giampetruzzi and colleagues reported in BMC Genomics in 2016 that infected Leccino plants showed much milder symptoms than the highly susceptible Ogliarola salentina. The trees still become infected. The IOC catalogue's own disease notes for Leccino cover cold, Verticillium dahliae, olive knot, leaf spot and olive fruit fly, and do not mention Xylella.
Is Leccino a protected variety or designation?
No. We pulled the full eAmbrosia register of 4,014 European geographical indications on 2 September 2026 and no registered name contains the word Leccino. The English application sheet behind Toscano PGI, which we fetched and read, names no cultivar at all — it specifies acidity, peroxide value, aroma, panel score, harvest date and extraction method instead.
Does Sidr & Stone sell Leccino olives?
No. We sell a single-estate Moroccan extra virgin olive oil and no table olives of any kind. This article exists because Leccino is an unusually clean example of a name that carries a great deal of reputation and no registration, and that distinction transfers directly to the oil aisle.
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
Leccino is a good, useful, well-documented cultivar, and almost none of what makes it interesting is on the tub. Its reputation rests on three things the label cannot carry: that it is agronomically forgiving, that it tolerates a disease that has devastated groves further south, and that it is one half of a planting partnership rather than a soloist. What the label does carry is a word that no register audits.
The habit that follows is a small one. Treat a cultivar name as useful information about a tree and weak information about a bottle or a tub. Then go and look at the things that are audited — the grade, the origin, the harvest year, the trade preparation — because those are the words somebody had to stand behind.
Our cold-pressed organic Marrakech olive oil — single-estate, rain-fed, organically grown and unfiltered — is available to pre-order, with fulfilment in the UK, EU, and US. First harvest, limited first pressing, estimated shipping from November 2026.
Pre-Order Sidr & Stone Organic Marrakech Olive Oil — Limited First Harvest →
Disclaimer: This article describes the Leccino cultivar, the European geographical indications register, the Codex standard for table olives and published research as they stood at the time of writing on 2 September 2026; register entries, standards, catalogue entries and product specifications may change, and readers should check current sources. The eAmbrosia register was pulled and filtered, and the English application sheet for Toscano PGI-IT-1512 was fetched and read, on that date. Comparisons 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.