SL28 and SL34: two names in Kenyan coffee

Selections, not quality scores

SL28 and SL34 are Arabica varieties associated with selection programmes in twentieth-century Kenya. Their codes identify varieties, not roast levels or tasting scores. Both are known for good cup potential in suitable conditions, while their agronomic traits differ. A variety’s reputation does not guarantee the condition of a particular harvested and processed lot.

Why a bag lists several varieties

A washing station may receive cherries from growers cultivating several varieties, so a lot might list SL28, SL34, Ruiru 11, and Batian. That is not inherently a flaw when the information is transparent. Kenyan AA and AB labels concern screen-size grading; they are not botanical varieties and should not be read as absolute flavour rankings.

Put acidity in context

Some Kenyan coffees show vivid acidity and fruit impressions, but not every lot tastes of blackcurrant. If a cup seems sharply sour, check water and extraction before blaming the variety. A modest adjustment to grind or brewing time may improve balance. Compare the same coffee at different temperatures to separate acidity from sweetness and finish.