Sicily's Nocellara del Belice Harvest Opens, and What Makes a DOP Castelvetrano
The Pantry Pulse, 29 September 2026.
Picking season opens at the end of September in the Belice Valley of western Sicily for the Nocellara del Belice, the green olive better known as the Castelvetrano. Olives meant for the protected table olive come off the trees by hand from now through October, and olives meant for oil can hang until mid-November. The harvest is when the picking and handling rules behind a protected Castelvetrano olive come into play, and those rules shape what ends up in the jar.
What opens this month
This year's campaign was planned from early summer. On 3 July, the local news site Itaca Notizie reported that the municipal administration of Campobello di Mazara, one of the three towns in the protected zone, had called employers' organizations, unions and regional representatives together to prepare the 2026 olive campaign. The town expected between 1,200 and 1,300 seasonal workers, arriving from 15 September.
In a 2022 article in Terrà, the Sicilian agriculture department's magazine, the Trapani office of the regional agricultural inspectorate describes the Belice harvest as running from the end of September to the middle of November, with timing set by whether the fruit is headed for the table or the mill. Olives bound for oil may be picked by hand or by machine.
The growing zone is small. The production rules for the protected table olive name three towns in the province of Trapani: Castelvetrano, Campobello di Mazara and Partanna. The inspectorate places the groves among those towns, beside Lake Trinità, a few kilometers from the sea and close to the temples of the ancient Greek city of Selinunte. It reports that the Nocellara del Belice makes up 95 percent of the olive cultivars grown in the area, and calls that concentration on a single variety a rare example of specialization, in Italy and across the European Union.
The same cultivar anchors two protected designations: Nocellara del Belice DOP for the table olive, under a regulation in the EU Official Journal of 21 January 1998, and Valle del Belice DOP for the oil, under one published on 21 August 2004. The inspectorate calls it the only product in Europe with two DOPs for the same variety, and notes that growers have found both uses over the past two centuries. The United Kingdom brought the olive name into its own register as a Protected Designation of Origin on 31 December 2020. The UK listing gives Italy as the country of origin and 21 January 1998 as the date of the original EU registration.
Picked by hand, at the plant within a day
The DOP production rules, hosted by CREA, Italy's agricultural research council, describe the harvest in close detail. Olives must be picked by hand, a method the text calls brucatura, and chemical agents that loosen fruit from the branch are banned. Picked fruit must be stored and moved in net-sided crates or on racks, in layers no deeper than 20 centimeters, and must go for processing no later than 24 hours after picking. The inspectorate adds that growers bring the olives to the processing plants in rigid perforated plastic crates and that the plants process them straight away.
The orchard rules are just as specific. Trees are trained in open, vase-type shapes at no more than 300 per hectare, and new plantings in other systems need regional approval. Yield is capped at 70 quintals per hectare, and the Sicilian Region can set lower limits year by year. The soils named are mostly loose and sandy, though deep clay soils also qualify.
The text does not give reasons for these rules. Taken together, the rules keep the fruit in shallow layers and keep the time between branch and processing short.
Three ways to cure a green olive
Processing starts with sorting the olives by size, and the next step is debittering, deamarizzazione in the inspectorate's Italian. The DOP permits three systems for green olives, all carried out within the province of Trapani: Sevillian-style lactic fermentation, a natural cure for olives that are starting to change color, and the Castelvetrano system.
The inspectorate's article explains how the three differ. The Castelvetrano method removes the bitterness completely and then keeps the olives in a salt solution, and the article calls the result sweet. The Sevillian method removes the bitterness only in part, then ferments and stores the olives in brine, for a result it calls semi-sweet. The natural method ferments whole or cracked olives and keeps them in brine, and the article says they stay pleasantly bitter. So Castelvetrano names a curing method as well as a town, and of the three it is the one the inspectorate calls sweet.
Why a Castelvetrano stays mild and bright green
The difference starts with lye, a solution of sodium hydroxide. A 2020 study in the journal Foods explains that lye soaking into the flesh breaks down oleuropein and ligstroside, the olive's bitter compounds, into hydroxytyrosol and tyrosol, which are not bitter. A 2023 review in the journal Molecules describes the Sevillian route: a few hours in lye, a wash to remove it, then one to four months in salt brine for a mild lactic fermentation. In the Castelvetrano route, the review says, the olives spend a few hours in lye and then up to a month in a mixed lye and salt brine, with no lactic fermentation afterward. The Foods study adds that in this system the olives stay alkaline for longer, so the lye can reach all the way to the stone, and that after washing they are kept refrigerated or heat-treated so that they do not ferment.
Skipping fermentation also decides the color. In a fermenting brine the liquid turns acidic, and the review explains that the acid pushes the magnesium out of the center of the chlorophyll molecule, turning chlorophyll into pheophytin. That reaction is what turns a fermented green olive from green to a grayish brown. In Castelvetrano-style olives the chlorophyll keeps its magnesium, and both papers report that the olives keep a bright green close to that of the fresh fruit.
That is the olive the inspectorate calls sweet: bitterness taken out all the way to the stone, no acid fermentation, and the green of the fresh fruit kept.
What else the rules cover
The rules also cover ripe black olives, cured either without an alkaline treatment or with one. Olives cured by the Sevillian or natural systems may then be further processed whole, cracked, pitted, sliced, scored or seasoned.
Packaging is regulated too. Glass jars, tins, heat-sealed plastic pouches, food-grade plastic tubs and terracotta are allowed. Each container must be sealed so the olives cannot be removed without breaking it. The words Nocellara del Belice must be followed immediately by the full name of the designation, printed in type of the same size, and export lots must carry the words prodotto in Italia. According to the inspectorate, the olives were traditionally sold loose from delicatessen counters and neighborhood markets, and are now sold in supermarkets too, with a shelf life that depends on treatments such as pasteurization or controlled atmosphere.
The DOP in numbers
The table sets each rule beside what it works out to.
| Rule | Figure | Worked out from the rules |
|---|---|---|
| Table-olive harvest | End of September through October | About five weeks |
| Oil-olive harvest | End of September to mid-November | About seven weeks |
| Picking | By hand; loosening agents banned | No chemical help at the branch |
| Crate depth | 20 cm maximum | About 8 inches |
| Time to processing | 24 hours maximum | Same day or next |
| Planting density (vase) | 300 trees per hectare maximum | At least about 33 square meters per tree |
| Yield cap | 70 quintals per hectare | 7,000 kg per hectare; about 23 kg per tree at maximum density |
| Green-olive cures | 3 systems | Castelvetrano, Sevillian, natural |
| Growing towns | 3 | Castelvetrano, Campobello di Mazara, Partanna |
| Share of local cultivars | 95 percent | Nearly a single-variety growing area |
| Protected names | 2 | Table olive 1998, oil 2004 |
The per-tree figure is a ceiling on the average, not a harvest estimate. An orchard planted at the maximum density may average no more than about 23 kilos of olives per tree. With fewer trees per hectare, each tree may carry more.
From Trapani to the table
The inspectorate lists the uses itself: cocktails, salads and antipasti, with the olive cream used as a base for sauces and bruschetta. For a board with more than one Italian green table olive, Fratepietro's Bella di Cerignola green olives (shop Bella di Cerignola green olives) can go alongside. For dinner, Morelli's busiate trapanesi (shop busiate trapanesi), a Sicilian pasta that carries the name of the same province, take chopped green olives in a sauce.
The complete guide to olives covers the wider family of table olives. For green olives at the bar, see The Martini Hour. On the oil side of the valley's two DOPs, the piece on DOP olive oil explains how a protected name works on a bottle.
Picking runs through October. For a jar labeled Nocellara del Belice DOP, the olive's identity starts at the tree: where it grew, that it was picked by hand, how deep it lay in the crate, how quickly it reached the processor and how its bitterness was taken out are all part of the definition. Castelvetrano names a process as much as a place.
Sources & Further Reading
- CREA: Disciplinare di produzione, Oliva Nocellara del Belice DOP (production specification)
- Terrà, Regione Siciliana: Valle del Belice, il regno della Nocellara (Vito Falco, Ispettorato agricoltura di Trapani, 13 December 2022)
- GOV.UK, Defra: Nocellara del Belice, Protected Designation of Origin register entry
- Itaca Notizie: Campagna olivicola 2026, il Comune di Campobello promuove un tavolo con il comparto (3 July 2026)
- Berlanga-Del Pozo, Gallardo-Guerrero and Gandul-Rojas, Influence of Alkaline Treatment on Structural Modifications of Chlorophyll Pigments in NaOH-Treated Table Olives Preserved without Fermentation, Foods (2020)
- The Fate of Chlorophylls in Alkali-Treated Green Table Olives: A Review, Molecules (2023)
