Cork Work and the Montado

Cork work is one of the oldest and most unique know-hows in Portugal, inseparable from the landscape that gives it origin: the montado. This duo — human gesture and ecosystem — sustains a chain that goes from the living cork oak to the cork stopper, insulation, and coatings, making Portugal the world’s largest cork producer, responsible for more than half of global production.

The montado, a cultivated landscape

The montado is an agro-silvo-pastoral system, an open forest shaped by human hands over centuries. Under the spaced canopies of cork oaks (Quercus suber) and holm oaks grow pastures and cereals like wheat, barley, and oats, while herds and pigs take advantage of the undergrowth. This low density — a few dozen trees per hectare — distinguishes the montado from a closed forest and creates a mosaic of great ecological value, a refuge for endangered species and a barrier against desertification.

In Portugal, the montado covers about 730,000 hectares and represents approximately one-fifth of the national forest area. It occurs mainly south of the Tagus, in Alentejo and Ribatejo, although the cork oak extends across almost the entire mainland. The cork oak is, moreover, among the first legally protected species in the country: its cutting is prohibited, and its exploitation regulated, in a rare example of active conservation.

Cork is the only forest raw material harvested without cutting the tree: the cork oak regenerates its bark and continues to produce, decade after decade, for more than a century.

Cork stripping, a gesture of precision

Cork extraction — stripping or harvesting — is done manually between May and August, when the sap facilitates bark separation. The first harvest, the ‘desbóia,’ occurs when the tree is around twenty-five years old and yields rough, virgin cork; only from the third extraction is the ‘amadia’ cork obtained, of quality for stoppers. Between each harvest, nine years pass, the time it takes for the inner bark to reconstitute a layer of similar thickness.

The harvester works with a long-handled, curved-blade axe designed for this task. The stroke must cut the cork without damaging the mother bark — a mistake compromises the tree’s health and the next harvest. It is a knowledge not learned from manuals: it is passed down from generation to generation, in the field, and requires years of practice to achieve a steady hand. That is why cork stripping is part of Portuguese intangible cultural heritage, with associated knowledge inscribed in the National Inventory of Intangible Cultural Heritage.

From forest to economy and culture

After harvesting, the cork is stacked to dry in the open air, boiled, trimmed, and processed — largely in the Santa Maria da Feira region, the industrial capital of the sector. From the plank comes the stopper, but also agglomerates, thermal and acoustic insulation, flooring, and technical materials. Cork exports amount to around 900 million euros annually and represent about 3% of Portuguese foreign sales.

More than a product, the montado is a way of life that articulates forest, agriculture, and extensive livestock farming. The guarding of herds grazing under the cork oaks is linked to practices like livestock dogs and pastoralism, and the whole is inscribed in the long tradition of agricultural heritage national. Defending cork work is, thus, simultaneously defending a craft, a landscape, and a balance between man and territory that few regions in Europe have managed to preserve.