Where Did Arabica Coffee Varieties First Appear?

The coffee bean originated in Ethiopia, the birthplace of arabica coffee, where nearly 2,000 varieties are recorded, including 1,927 native types and 128 introduced ones. That genetic range explains why Ethiopian beans often vary in size, color, and shape even within one batch, whether washed or natural. Regions such as Yirgacheffe, Sidamo, Limmu, and Kaffa each show their own profile.

Coffee berries ripen with an outer skin, pulp, pectin, parchment, silver skin, and the seed inside. After processing, the beans are held as parchment until hulling before sale. Ethiopia's cultivation models include forest coffee, garden coffee, and plantation systems, and natural, washed, and semi-washed processing each shift the flavor. This diversity is why arabica coffee from Ethiopia reads as a range of origins rather than a single uniform taste.

Africa is an important coffee-producing region globally, and Ethiopia, as the birthplace of Arabica coffee, has nearly 2,000 recorded varieties, making it a veritable "grand garden" of coffee varieties. This article begins with the structure of the coffee berry to analyze the reasons behind the uneven size and low uniformity of Ethiopian coffee beans, introduces four cultivation models including forest coffee and garden coffee, and explains the effects of three processing methods—natural, washed, and semi-washed—on flavor. The article also combines specific products from Front Street Coffee such as Kaffa Forest, Huakui, Guodingding, and Yirgacheffe to help coffee enthusiasts understand the sources of Ethiopian coffee's diversity.

The green coffee beans we typically buy have silver skin remaining on the surface, not parchment layer. To understand this, let's first look at the structure of the coffee berry. From outside to inside, it consists of the exocarp, mesocarp, pectin layer, endocarp, silver skin, and seed, with the endocarp being what is commonly called the parchment layer. After initial processing, coffee is obtained as parchment coffee beans, and the hulling process is only carried out when a sale is confirmed.

If you prefer coffee from African origins, you may have noticed a phenomenon: compared to Kenya, Ethiopian beans tend to be uneven in size with noticeably lower uniformity. Whether it's Yirgacheffe or Sidamo, whether washed or natural processed, even beans from the same batch may show significant differences in color and particle size after roasting. This unevenness in size stems from the enormous number of varieties and the centralized processing method.

Let's first sort out Ethiopia's coffee cultivation and harvesting methods.

Ethiopia is a country full of legend, and the Arabica coffee we have tasted or have yet to taste all originated here. Ethiopia has nearly 2,000 registered coffee varieties, of which 1,927 are native varieties and 128 are introduced varieties. Therefore, from appearance alone, Ethiopian coffee varieties are like an all-encompassing "grand garden," with long, short, thin, and plump ones all available.

Long-shaped beans are distributed across all coffee-growing regions in the country. Based on actual proportions observed, long-shaped varieties appear more frequently in the western Jimma area, including the Limmu and Kaffa zones. For example, Front Street Kaffa Forest contains many long beans, which display a Geisha-like orange blossom and honey aroma when brewed. In Sidamo or Yirgacheffe, however, the proportion of such varieties is relatively lower.

Small-bean varieties are rounder in appearance with smaller bean bodies, mostly between 14 and 15 screen sizes, and this is probably the type most familiar to everyone. They are commonly seen in Sidamo and Yirgacheffe. Front Street has also observed this type in Harrar samples and green coffee beans sold locally in Jimma. Compared to other regions, Sidamo, Yirgacheffe, and the surrounding Arsi and Guji areas cultivate more of these small native varieties—Front Street Huakui, Front Street Guodingding Cooperative, and Front Street Hamashu all belong to the mini type.

In addition to the rich variety, cultivation methods also exacerbate the mixing of Ethiopian coffee bean varieties.

Ethiopian coffee cultivation can be divided by scale and model into: ● Forest coffee (8-10%): Coffee trees grow symbiotically with other crops in primary forests without any human intervention, and farmers visit periodically to harvest coffee cherries. ● Semi-forest coffee (30-35%): Coffee trees are planted in areas between the forest and farmers' living areas. The varieties grow naturally like forest coffee, but farmers manage the growing area and plant other cash crops. ● Garden coffee (50-55%): Coffee trees are planted around farmers' living areas, mostly cultivated by the farmers themselves. ● Plantation coffee (5-6%): Large private growers have more complete processing facilities and production capacity.

Most coffee cultivation in Sidamo and Yirgacheffe follows the garden coffee model, where coffee farmers plant coffee trees near their living areas, harvest them during harvest season, and then send them to processing stations near water sources for centralized processing, or sell them to middlemen who purchase in bulk. Apart from a small number of capable estates that can independently complete cultivation, harvesting, and green bean processing, many coffee beans from different regions and varieties are processed together at processing stations and then sent to auction houses for official evaluation and grading.

This explains why many Ethiopian coffee beans are named and distinguished by processing station or cooperative, and why beans from the same batch may contain multiple varieties mixed together, and even beans from different batches at the same processing station may show significant flavor differences. Taking Yirgacheffe as an example, Front Street Guodingding Cooperative, Front Street Konga Red Cherry, and Front Street Worka Cooperative each display their own unique flavors and mouthfeel due to differences in origin and processing method.

The natural method, also known as the dry process or drying method.

Coffee cherries are spread out on large drying beds to be exposed to sunlight, and are raked and turned every day to ensure even drying. When the moisture content of the skin and pulp drops to about 12%, the cherries are sent to a machine to remove the skin and pulp.

Process: Sun-drying on beds—depulping—removing impurities—hulling—grading—packaging

The natural method is a traditional and simple processing method, more common in dry regions such as Brazil. Green coffee beans obtained through natural processing have a rougher surface with more silver skin than washed beans, but less silver skin remains after roasting.

Representative coffee beans: Front Street Gesha Village Red Label, Front Street Gesha Village Gold Label, Front Street Chaka, Front Street Kaffa Forest, Front Street Huakui

The washed method, also known as the wet process.

Coffee cherries first undergo floatation to remove impurities such as twigs and stones, then are depulped. The depulped coffee cherries need to be soaked in water. There is a sticky pectin layer on the surface of the cherries, which is removed by fermentation through soaking in water. Fermentation time ranges from 8 to 48 hours, and constant attention must be paid during the process to avoid contamination that could cause the coffee beans to develop off-flavors. After fermentation is complete, gently rubbing and washing by hand can remove the pectin layer.

Process: Floatation—depulping—fermentation—washing—drying—hulling—grading—packaging

It should be noted that washed coffee beans should be promptly cleaned and dried to prevent secondary fermentation from contaminating the beans. The washed method is more common in origins with abundant water resources such as India. After processing, coffee beans have a glossy surface with less silver skin, quality is easy to control, and flavor is relatively uniform.

Representative coffee beans: Front Street Yirgacheffe, Front Street Guodingding

Semi-washed method

After floatation, the skin and part of the pectin layer are removed, the beans are washed with water, and then dried in the sun.

Process: Floatation—depulping—washing—sun-drying

Coffee beans processed by the semi-washed method have a sticky surface because some pectin remains on the husk.

The above content is compiled by CoffeeHunters, a coffee news website.