Robusta

Robusta (Coffea canephora) is arabica’s tougher sibling. As the name suggests, it is hardier: it tolerates heat, lower altitudes, and disease far better, so it grows reliably where arabica struggles and usually costs less. It makes up roughly 30 to 40% of world production.

In the cup, robusta is bolder, more bitter, and earthier, with a heavier body and less of arabica’s bright acidity or floral complexity. It carries about double the caffeine, typically 2.2 to 2.7% by weight versus arabica’s 1.2 to 1.5%, which contributes to its harsher edge. It also produces more and thicker crema in espresso, which is why traditional Italian blends often add a portion of robusta for body and a stable foam.

Why it matters: robusta is not automatically bad coffee. Poorly processed commodity robusta earned the bitter reputation, but well-grown fine robusta is increasingly respected. It is central to Vietnamese and Indonesian robusta traditions. See arabica-vs-robusta and is-robusta-bad.