Robusta is the trade name for Coffea canephora, the second most cultivated coffee species, prized for yield and disease tolerance.
'Robusta' is both the common name for the species Coffea canephora and, informally, the trade term covering the whole diverse group of cultivars, clones and landraces grown under that species. Native to the humid lowland forests of central and western sub-Saharan Africa (from Guinea to Uganda to Angola), robusta now accounts for roughly 40% of global coffee production, up from about 25% in the early 1990s. Genetically, cultivated robusta divides into two broad groups: the Guinean group (narrow internodes, high caffeine, low bean weight, drought resistance, early harvest, west-central African origin) and the more widespread Congolese group (higher rust resistance, medium caffeine, heavier beans, larger internodes, tall growth, late harvest, central African origin), each containing further regional subpopulations. Robusta is allogamous (self-incompatible, so a single clone cannot self-pollinate), meaning farmers must interplant compatible clone groups to get fruit set, meaning robusta plantations are never genetically uniform monocultures the way many Arabica farms are. Compared to Arabica, the cup tends to be lower in acidity, higher in bitterness and fuller-bodied, driven partly by higher pyrazine content, though careful processing can produce specialty-grade lots. Regional names like 'conilon' (Brazil), 'nganda' and 'kouilou/quillou' generally describe local populations or trade usage rather than genetically distinct, formally registered varieties.
History
First documented cultivation began around 1870 in Congo (Lomani River region). A subtype called koillou (later 'conilon' in Brazil) was observed in the wild by the French in 1880 between Gabon and the mouth of the Congo River. The species was named by Louis Pierre in 1895, and the name was first published with a description by Froehner in 1897. Seed sent from Congo to Brussels reached Java around 1900, robusta then entered India via Java, the conilon group reached Espirito Santo, Brazil in 1912, and Central America received material via Guatemala between 1930 and 1935.
Field notes
- i
The name 'robusta' was first used by the botanist Linden in 1900, referring to the plant's apparent hardiness.
- ii
Robusta plantations are necessarily genetically mixed: because robusta cannot self-pollinate, farmers must grow multiple compatible clone types together simply to get fruit.
In the cup, according to guides
- AcidityLessRobusta cups tend lower in acidity than Arabica.
- BitternessMoreRobusta cups tend higher in bitterness, partly attributed to higher pyrazine content.
- BodyMoreRobusta is generally described as fuller-bodied than Arabica.
Grown in