What is the SL28 coffee variety?

The SL28 variety is perhaps the most famous coffee cultivar to emerge from Kenya. Its history dates back to the 1930s when Scott Agricultural Laboratories (hence the 'SL' designation) was tasked with identifying and breeding coffee varieties that could thrive in the unique climate of Kenya. The goal was to find a plant that offered both high yield and superior cup quality, and SL28 was the standout result of that research.

What makes SL28 so special is its sensory profile. It is widely celebrated for its intense, wine-like acidity and deep, complex fruit notes, most notably blackcurrant and citrus. These characteristics have made it a favorite among specialty coffee professionals and consumers alike. When grown at high altitudes in the rich, volcanic soils of Kenya, SL28 consistently produces a cup that is both powerful and elegant, setting the standard for what many consider to be the quintessential Kenyan coffee experience.

However, SL28 is not without its challenges. While it is prized for its quality, it is also known to be susceptible to common coffee diseases, such as Coffee Berry Disease (CBD) and leaf rust. This vulnerability has led many farmers to experiment with other varieties or hybrids, but the demand for the unique flavor profile of SL28 remains incredibly high. It is a testament to the variety's quality that farmers continue to cultivate it despite the risks, as the market premium for high-quality SL28 is significant.

In the world of coffee varieties, SL28 is often mentioned alongside other 'SL' series cultivars like SL34. While they share a similar heritage, they are distinct in their growth habits and flavor nuances. For the coffee enthusiast, encountering an SL28 is an opportunity to taste a piece of coffee history. It is a variety that demands respect for its contribution to the specialty coffee movement and its enduring ability to deliver a truly memorable cup.

In practice, when you see 'SL28' on a coffee bag, you can generally expect a bright, acidic, and fruit-forward experience. It is a variety that rewards those who appreciate complexity and intensity in their coffee. Whether brewed as a filter coffee or an espresso, SL28 remains a benchmark for quality and a shining example of how specific cultivars can define the character of a region.