Coffea arabica var. SL28

What is Coffea arabica var. SL28? It is arguably the most famous and sought-after coffee variety in Kenya. Selected by the Scott Agricultural Laboratories (SL) in the 1930s, this variety was chosen specifically for its drought tolerance and its remarkable cup quality. It has since become the benchmark against which many other African coffees are measured.

Coffee SL28 is part of the Bourbon genetic group, which contributes to its high-quality potential. The trees are known for their large bean size and their ability to produce a cup with intense, wine-like acidity and deep, complex fruit notes—often described as blackcurrant or tomato. These characteristics have made it a staple in the specialty coffee industry, particularly for roasters who specialize in high-altitude, washed-process coffees.

Despite its fame, SL28 is notoriously delicate. It is highly susceptible to major coffee diseases like Coffee Leaf Rust and Coffee Berry Disease. This makes it a challenging variety for farmers to manage, often requiring significant care and investment to protect the crop. Because of this, it is frequently grown in high-altitude regions where the cooler climate helps mitigate some disease pressure.

In practice, SL28 is a variety that rewards the drinker with an unforgettable sensory experience. It is the quintessential Kenyan coffee, offering a level of clarity and intensity that is difficult to replicate. When you buy a bag of coffee labeled SL28, you are purchasing a piece of coffee history that prioritizes flavor above all else, representing the pinnacle of what the Kenyan terroir can produce.