The History of The SL28 Coffee Varietal

The world of coffee is a complex and fascinating one, with countless varieties, each with its unique characteristics and history. Among these, the SL28 coffee varietal stands out as a true icon. Its journey from a humble origin to global acclaim is a testament to the power of natural selection and human ingenuity.

Tanzania’s coffee history (before SL28).

The earliest evidence of coffee cultivation in Tanzania can be traced back to the 16th century. The Haya tribe, inhabiting the northwest region, were among the first to cultivate coffee. They used the beans not as a beverage but as a stimulant, often boiling and steaming them with herbs before consumption.
German colonization in the late 19th century introduced Arabica coffee to the region, particularly in the fertile slopes of Mount Kilimanjaro and Mount Meru. The Germans established plantations and encouraged local farmers to cultivate coffee, leading to a surge in production.

After World War I, Tanzania came under British rule. The British continued to promote coffee cultivation, establishing cooperatives to support small-scale farmers and improve the quality of the beans. These cooperatives played a crucial role in organizing the coffee industry and ensuring fair prices for farmers.

A Serendipitous Discovery

In the 1930s, British colonial scientists at the Scott Agricultural Laboratories in Kenya were on a mission to improve coffee production in East Africa. Their goal was to develop a variety that was both high-yielding and resistant to diseases. To achieve this, they embarked on a comprehensive study of various coffee trees, meticulously selecting 42 promising specimens.

Among these 42 trees, one particular variety, sourced from Tanganyika (now Tanzania), caught the attention of the scientists. This tree exhibited remarkable drought resistance and a unique flavor profile. It was given the designation "SL28," with "SL" representing Scott Laboratories and "28" signifying its sequential number.

The Rise of a Coffee Star

The SL28 variety quickly gained recognition for its superior qualities. It produced high yields of coffee cherries, which, when processed, yielded beans with exceptional cup quality. The beans were characterized by their bright acidity, complex flavor profile, and a distinctive floral aroma. These characteristics made SL28 a favorite among coffee connoisseurs and roasters alike.

The success of SL28 can be attributed to several factors:

• Genetic Superiority: The specific genetic makeup of the SL28 variety endowed it with desirable traits such as disease resistance, high yield, and exceptional cup quality.

• Optimal Growing Conditions: The cool, high-altitude regions of East Africa, particularly Kenya and Tanzania, provide ideal conditions for the cultivation of SL28. The specific microclimates in these regions contribute to the development of the bean's complex flavor profile.

• Careful Cultivation and Processing: The meticulous care and attention given to the cultivation and processing of SL28 beans further enhance their quality. Proper pruning, fertilization, and harvesting techniques are essential to maximize the potential of this exceptional variety.

The Global Impact of SL28

The impact of SL28 extends far beyond its origins in East Africa. It has been widely cultivated in various coffee-producing regions around the world, including Central and South America. While it may not always reach the same heights of quality as when grown in its native environment, SL28 has nevertheless contributed to the global coffee landscape.

The popularity of SL28 has also driven innovation in the coffee industry. Roasters and baristas have experimented with different brewing methods and roasting profiles to extract the best flavors from these beans. As a result, SL28 has become a staple in many specialty coffee shops and a beloved choice for coffee enthusiasts worldwide.

Similar Coffee Varietals to SL28.

Bourbon:

Originating in Yemen. Bourbon shows characteristics of high acidity, floral notes, and a smooth, wine-like body. Both SL8 and Bourbon varieties are known for their bright acidity and complex flavor profiles. However, Bourbon often has a more pronounced sweetness and a fuller body.

Caturra:

Caturra originated in Brazil and also has high acidity, bright flavor, and a delicate sweetness. SL28 and Bourbon are high-quality, high-yielding cultivars. Caturra often exhibits a more pronounced sweetness and a slightly less complex flavor profile than SL28.

Gesha:

Gesha is famous all over the world as a revered coffee varietal. Originally from Ethiopia, Gesha has exceptional sweetness, floral and fruity notes, and a silky smooth mouthfeel. SL28 and Gesha are prized for their complex flavor profiles and high acidity. However, Gesha is often considered to have a more refined and delicate flavor.

Bourbon Pointu:

This one comes from Brazil and is noted for high acidity, floral notes, and a bright, clean cup. Both Bourbon Pointu and SL28 are high-quality, high-yielding cultivars. Bourbon Pointu often exhibits a more pronounced acidity and a more complex flavor profile than Caturra.

It's important to note that the specific flavor profile of a coffee can be influenced by many factors, including terroir, processing methods, and roasting techniques. However, these varietals are often considered to be among the best in the world and share many similarities with the renowned SL28.

The Future of SL28

As the coffee industry continues to evolve, the future of SL28 remains bright. While challenges such as climate change and disease outbreaks pose threats to coffee production, ongoing research and innovation can help ensure the long-term sustainability of this iconic variety.

By understanding the history and characteristics of SL28, we can appreciate the complex journey that our morning cup of coffee takes. From the humble origins of a single tree to its global impact, SL28 serves as a reminder of the power of nature and human ingenuity.