Robusta

Robusta (Coffea canephora) is the second most widely produced coffee species, accounting for approximately 30–40% of global coffee production. True to its name, Robusta is a hardier plant than Arabica: it thrives at lower elevations (sea level to 2,500 feet), tolerates higher temperatures, resists diseases like coffee leaf rust more effectively, and produces higher yields per plant. These agricultural advantages make Robusta significantly cheaper to produce, which is why it dominates the instant coffee and commercial blend markets.

In the cup, Robusta is characterized by a bold, full body, low acidity, and higher bitterness compared to Arabica. It contains nearly twice the caffeine — approximately 2.2–2.7% by weight versus Arabica's 1.2–1.5% — which contributes both to its bitter taste and its natural pest resistance (caffeine acts as a natural insecticide). Flavor descriptors for Robusta tend toward earthy, woody, nutty, and grain-like, with less of the fruity and floral complexity found in high-quality Arabica.

Vietnam is the world's largest Robusta producer, followed by Brazil, Indonesia, and Uganda. In traditional Italian espresso culture, a percentage of Robusta (typically 10–30%) is often blended with Arabica to add body, crema, and a caffeine boost to espresso. The thick, persistent crema that Robusta produces is visually and texturally valued in classic espresso preparation.

The specialty coffee world has historically dismissed Robusta, but a growing "fine Robusta" movement is working to change that perception. Carefully grown, processed, and roasted Robusta from select farms in India, Uganda, and Vietnam can produce cups with chocolate, spice, and nutty notes that challenge assumptions about the species' limitations. These lots are scored on a separate Robusta cupping protocol developed by the Coffee Quality Institute.