SL28 Coffee Variety

SL28 is the variety most responsible for Kenya’s reputation, and it is a demanding one to grow. World Coffee Research describes a tall tree with large beans and low yield potential, susceptible to leaf rust, coffee berry disease, and nematodes, but with exceptional quality potential at altitude. Growers accept the poor agronomy because of what the variety does in the cup.

The three reviewed lots are not Kenyan, which is the useful part: two Tanzanian lots and one from Costa Rica’s Tarrazu all land in the same fruit-dense register. Blackberry, blood orange, and pink grapefruit zest recur, with red currant, jasmine, and dark chocolate depending on the lot, and the reviews describe a creamy, syrupy, or viscous mouthfeel under bright acidity. The washed Ngila Estate lot and the natural Vahora lot both earned a 95 from Coffee Review, so process shifts the fruit character more than it changes the quality ceiling.

That cross-origin consistency is the argument for treating SL28 as a variety trait rather than purely a Kenyan one, with the caveat that three lots cannot isolate genetics from the farms, altitudes, and processing behind them. The seed itself has a clear paper trail: a single tree selected in 1935 at Scott Agricultural Laboratories from a population labeled Tanganyika Drought Resistant. For its sibling selection and the disease-resistant hybrids built to replace both, see the related entries.