Harvest Methods: Tradition and Innovation in Trás-os-Montes and Alto Douro

How olives are actually picked in this territory — from the ancestral pole-beating technique to vibrating machines, and why the chosen method directly shapes the oil that ends up in the bottle.

There's a simple question rarely asked by anyone visiting an olive grove in October: how does that olive actually end up on the ground? The answer seems obvious — "it's picked" — but it hides a technical decision with direct consequences for the quality of the oil, one that splits the territory between two worlds that coexist side by side: the traditional hillside grove and the modern, intensive grove.

The two oldest manual methods

Before any machine existed, there were — and still are — two distinct manual methods. "Ripar" (stripping) means loosening the olives directly from the branches by hand or with a small rake-like tool, letting them fall onto cloths or nets spread on the ground around the trunk. "Varejar" (pole-beating) — the method most associated with Trás-os-Montes, and the one most visible in participatory harvest experiences — means carefully tapping the branches with a long pole, letting the ripe olives fall without forcing down the ones that aren't ready yet.

Both require time and labour, which is exactly why they're still practised mainly on traditional, rain-fed groves, with centuries-old trees and terraced hillsides — where a machine simply cannot operate.

Mechanisation: trunk and canopy shakers

Over the past few decades, mechanical shakers have become common in newer, flatter groves. There are trunk shakers, which grip the tree's trunk and transmit a vibration that shakes olives onto nets already laid out, and canopy or branch shakers, smaller and portable, used in smaller or irregular groves where a larger machine wouldn't make sense.

According to the Association of Olive Growers of Trás-os-Montes and Alto Douro (AOTAD), this mechanisation has grown steadily in the region over the past two decades, a direct response to the shortage of seasonal labour — a challenge Portuguese olive growing shares with nearly all agriculture in the country's interior.

The innovation frontier: continuous harvesting

At the leading edge of Portuguese innovation sits the Continuous Olive Harvesting Machine (MCCA), developed in partnership between the company Victor Cardoso Lda. and the Rural Engineering Department of the University of Évora, with funding from the PRODER programme. The equipment, publicly tested at Herdade da Torre das Figueiras, in Monforte, approaches the trees from the side using two semi-towed units pulled by tractors, allowing continuous harvesting in intensive groves — without needing to shake each tree individually. It's an example of the kind of innovation happening in Portuguese olive growing more broadly, though designed mainly for the large intensive groves of the south, quite different from the Trás-os-Montes landscape.

Why the method matters for what ends up in the bottle

The choice of harvest method isn't just a matter of efficiency — it directly affects the oil's quality. Olives picked by hand or with gentle vibration arrive at the mill with less physical damage, which delays the onset of oxidation and helps preserve the fruit's sensory characteristics. Damaged olives, or those picked up off the ground after falling naturally rather than being actively harvested, tend to produce oils with lower stability and higher acidity, precisely because deterioration begins earlier. This is also why ripeness at the time of picking — green, turning purple, or already dark — determines the final profile: green olives yield more bitter, intense oils; riper olives, softer ones.

The two worlds that coexist in TMAD

In Trás-os-Montes and Alto Douro, tradition and innovation aren't successive phases of the same process — they coexist side by side, often within the same municipality. The rain-fed grove, with centuries-old trees and steep hillsides, remains practically impossible to mechanise, and that's where the pole and the net remain, in practice, the only viable option. Meanwhile, newer groves, planted on more even ground, have been adopting mechanical shakers as a direct response to labour shortages. This coexistence is also what makes the territory interesting for anyone who wants to understand Portuguese olive growing in its diversity — rather than a single "tradition versus progress" narrative.

For those who want to see these methods in action, several participatory harvest experiences in the region — such as those organised in Macedo de Cavaleiros and Vila Flor — rely precisely on the traditional pole-and-net method, as it's best suited to visitor participation.

The olive oil of Trás-os-Montes can't be explained. It has to be tasted.

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