What is the most common coffee varietal?

The common misconception that a single "varietal" dominates the world stems from confusing coffee species with coffee varieties. Arabica and Robusta are species, not varietals. Within the Arabica species, genetic diversity is remarkably low—a phenomenon often cited as a risk to the industry's future. Historically, the Typica variety served as the foundation for much of the coffee grown in the Americas, but its low yield and high susceptibility to disease led to its widespread replacement by dwarf varieties like Caturra and various hybrids. For a producer, the choice of variety is a multi-decade financial commitment. A farmer must balance the cup quality demanded by specialty markets against the harsh reality of agronomic performance: resistance to coffee leaf rust, optimal altitude, and expected yield. Because a coffee tree remains productive for 20 to 30 years, a poor variety selection can lead to cumulative financial losses that span a generation. Consequently, the "most common" variety in any given region is rarely a matter of global popularity, but rather a calculated response to local environmental pressures and the specific economic needs of the farm. Organizations like World Coffee Research now provide open-access catalogs to help producers navigate these high-stakes decisions, moving the industry away from the historical reliance on a few vulnerable, low-yielding heirloom plants.