
SL-28
SL-28 was developed by Scott Laboratories in Kenya in the 1930s. It is prized for its complex citrus acidity, deep berry and stone fruit flavors, and heavy body. SL-28 is drought-resistant but susceptible to coffee berry disease.
Tasting Notes
Best For
Growing Altitude
1400-2000m
Kenyas Prized Selection
SL-28 was developed in the 1930s at Scott Agricultural Laboratories (now the National Agricultural Laboratories) in Kenya. Selected from a drought-resistant variety from Tanganyika (modern Tanzania), it was originally chosen for its ability to survive harsh conditions. What researchers did not expect was that it would produce one of the most extraordinary cup profiles in the coffee world.
Characteristics
SL-28 is a tall, open-branching tree with broad leaves and large cherries. It has deep root systems that allow it to access moisture during dry periods, contributing to its drought tolerance. The variety is susceptible to coffee berry disease (CBD) and leaf rust, which limits its viability outside of Kenya, but its cup quality makes it worth the extra effort for dedicated producers.
Flavor Profile
SL-28 is legendary among specialty coffee professionals:
- Intense blackcurrant and dark berry notes
- Bright, phosphoric acidity that is juicy and vibrant
- Complex citrus layers including grapefruit and blood orange
- Full body with a syrupy, wine-like mouthfeel
- Long, sweet finish with brown sugar and spice
Kenyas unique terroir of red volcanic soils, high altitude, and distinct wet/dry seasons amplifies these characteristics, making Kenyan SL-28 among the most sought-after and expensive coffees globally.
Growing Conditions
SL-28 performs best at elevations between 1,500-2,100 meters on Kenyas central highlands. The variety requires careful management and is typically grown on small estates or by cooperatives of smallholder farmers who deliver cherries to central washing stations.
Competition Success
SL-28 lots regularly command top prices at Kenyan coffee auctions and have won numerous Cup of Excellence and other specialty competitions. AA grade SL-28 from estates like Nyeri, Kiambu, and Kirinyaga are benchmark coffees for the specialty industry.
Best Brewing Methods
SL-28 demands attention and rewards it. Pour-over methods at light to medium roast showcase the blackcurrant complexity. Its also exceptional as a single-origin espresso where the concentrated body and acidity create an electric shot.
Did you know?
SL-28 is thought to have its genetic origins in the Tanganyika Drought Resistant variety from Tanzania.
Related
Frequently Asked Questions
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Researched and compiled by CoffeeTrove. Last updated March 2026.



