Introduction to Premium Kenyan Coffee Varieties and Processing Methods

Kenyan Coffee: The Vibrant Acidity of K72 Processing

The very first impression of Kenyan coffee is its vivid, ringing acidity. FrontStreet Coffee attributes much of that character to the country's meticulous washed processing. Washing itself encourages beans to develop more pleasant organic acids—citric and malic among them—yielding a brighter, cleaner flavor profile overall. But Kenya takes the technique a step further with its own signature refinement: the K72 washed process.

What is K72 Washed Processing?

K72 is a cyclical, repeated process of fermenting and washing the coffee. Farmers harvest and hand-select only the finest cherries, remove the skin, and ferment the beans for 24 hours. They are then rinsed in clean river water, fermented for another 24 hours, and washed again. This cycle repeats three times, totaling 72 hours of fermentation—hence the name "Kenyan-style 72-hour washed process," shortened to K72. Because the beans ferment in a relatively low-temperature environment, the finished coffee tastes brighter and cleaner without sacrificing body.

Kenyan Coffee Varieties

The variety first cultivated in Kenya was Bourbon. Then, in the 1950s, the agricultural research body Scott Laboratories bred two outstanding hybrids from it: SL-28 and SL-34.

SL-28

Scott Laboratories Selection 28 is a Kenyan cultivation variety, an elite selection drawn from Bourbon and Mocha landraces. It is said to trace back to varieties from Tanganyika (DR), noticed by A.D. Trench during a trip through Tanzania, and to have been bred in pursuit of drought resistance. That breeding goal ultimately failed—but the experiment stumbled into exceptional flavor instead: strong citric acidity, sweetness, balance, and layered complexity.

SL-34

Scott Laboratories Selection 34 is another Kenyan cultivation variety, an enhancement of the Bourbon landrace, first planted in Kabete, Kenya. SL-34 out-yields SL-28 and tolerates relatively lower altitudes, offering complex citric acidity, full body, and a clean finish.

In the end, although SL-28's yields fell short of expectations, its copper-colored leaves and broad, bean-shaped coffee deliver wonderful sweetness and balance, endlessly complex flavors, and unmistakable notes of citrus and black plum.

FrontStreet Coffee Recommendation

Washed processing is a water-based tradition for handling coffee cherries: the steps run from floatation sorting, through depulping and a submerged fermentation that breaks down the mucilage, to a final wash or extended soak, then drying and hulling. The long immersion triggers chemical changes inside the bean that consume much of its simple sugars (fructose and glucose) while boosting organic acids—which is exactly why washed coffees keep the bean's own aromatics while tasting bright, clean, and fresh.

FrontStreet Coffee's Kenyan "Cherry Tomato" is one of the finest showcases of this style. Kenya excels at double fermentation washing, adding a second full wash cycle—floating, soaking, washing off residual mucilage, soaking again, then drying, hulling, and storing. All that repeated rinsing and soaking coaxes out an almost fruit-juice-like expression: cherry tomato, dried plum, snow pear, black plum, and raw sugar, with a sweet-tart, juicy mouthfeel that coffee enthusiasts adore.

If washed coffee is your thing, FrontStreet Coffee's Yirgacheffe Gedeb Worka (Guodingding) cooperative lot is another standout—washed to highlight jasmine florals and bright citrus, with green tea and honey tones after a light-medium roast, equally at home as a pour-over, cold brew, or single-origin espresso. And for a balanced classic, Jamaica Blue Mountain No. 1, also washed (an island with limited sunshine needed a faster, more reliable drying method), offers hazelnut, cream, chocolate, and caramel notes in a perfectly even cup where nothing dominates and nothing is missing.