What is the difference between Bourbon and Typica varietals?

The distinction between Bourbon and Typica is less about a simple binary and more about understanding two foundational 'genetic groups' that define the majority of the world's Arabica production. Historically, these were viewed as two distinct varieties, but modern DNA fingerprinting by organizations like World Coffee Research has revealed they are actually broad lineages. When seeds were moved from Ethiopia to Yemen and subsequently to India and beyond, only a handful of plants were transported at each stage. This 'genetic bottlenecking' meant that the plants arriving in new regions were not representative of the full diversity of their ancestors, but rather small, isolated subsets that evolved into the specific varieties we recognize today.

For the farmer, this history is a practical burden. Both lineages are notoriously susceptible to coffee leaf rust and other pathogens, forcing producers to rely on modern hybrids that often use Bourbon or Typica as a 'quality' parent while crossing them with disease-resistant stock. A common misconception is that a variety named 'Typica' or 'Bourbon' is pure; in reality, many regional cultivars—like SL28 or various Indonesian selections—are genetically related to these groups but are distinct entities. Furthermore, the industry is currently grappling with 'marketing misnomers,' where varieties like 'Typica Mejorado' are sold under a famous name despite genetic testing proving they are entirely different, often hybrids with Ethiopian landraces. For producers, the value of these lineages lies in their potential for high-end cup profiles, but they require intensive management and high-altitude environments to mitigate their inherent fragility and low productivity compared to modern, introgressed cultivars.