What is terroir in coffee?

A coffee's terroir is the full set of natural and cultural conditions that shape the bean: soil (minerals, drainage, pH), altitude, climate (temperature, rainfall, wind), sun exposure, variety, and human practices (pruning, shade, fertilisation, picking). As with wine, it is the sum of these factors that explains why the same cultivar can cup very differently from one region to another.

The word 'terroir' crossed over from French wine vocabulary into the specialty coffee world in the 2000s. Boiled down, it covers four poles: soil, climate, plant genetics, and human choice. No single pole explains a cup.

Soil first. The most celebrated coffees often grow on young volcanic soils — Guatemala (Antigua, Atitlán), Costa Rica, El Salvador, Rwanda, Kenya. These soils are rich in phosphorus, potassium and magnesium, well drained, frequently acidic (pH 5 to 6), which helps the tree absorb nutrients. By contrast, sedimentary or heavy-clay soils (low-elevation Cerrado in Brazil) tend to give more neutral cups, with less brightness.

Climate next. A strong coffee terroir combines 1,500 to 2,500 mm of well-distributed annual rainfall, a clear dry season (flowering then harvest), a large day/night temperature swing (10 to 15 °C) that favours aromatic concentration, and little scorching wind. Altitude — treated in its own FAQ — mainly acts through temperature. Latitude matters too: an equatorial coffee (Colombia, Ethiopia) gets two flowerings per year, while a more tropical origin (Brazil, Rwanda) gets only one.

Genetics is the third pillar. A Bourbon and a Catimor planted at 1,800 metres on the same soil do not give the same cup even when processed identically: SCA cupping can measure gaps of up to 5 points between them. That is why a Brussels specialty roaster always prints the variety next to the region on the bag.

Finally, the human hand. Shade choice (grevillea, inga, banana), planting density (2,000 to 5,000 trees per hectare), picking frequency (three to eight selective passes in Kenya or Ethiopia to harvest only ripe cherries, against large-scale mechanisation in Brazil), processing protocol, drying, storage: each decision signs the final terroir. For a curious Belgian drinker, tasting two Ethiopian lots in parallel — a floral Yirgacheffe next to a woody-fruity Harrar — illustrates terroir faster than any lecture.

The four pillars of coffee terroir