What Actually Are Arabica Coffee Beans?

Most coffee drunk worldwide comes from the Arabica species, scientific name Coffea Arabica, also called small-bean coffee. It originated in Ethiopia, was first used as medicine, and spread through Arab trade in the 16th century. Its plants suit mountainous altitudes of 600 to 2,200 meters, 15 to 24 degrees Celsius, and 1,200 to 2,200 millimeters of annual rainfall.

Arabica beans are oval with a narrow, S-shaped center crack and a fairly flat back. Well-known lots such as Jamaica Blue Mountain, Panama Geisha, and Ethiopia Yirgacheffe all belong to the species. Representative cultivars include Typica, Geisha, Bourbon, Caturra, and SL28/34, and Typica coffee is among the oldest of them, helping explain the range of flavors found across menus.

On café menus, we often see the word "Arabica," but many people don't really understand what it actually means. In fact, the vast majority of coffee beans consumed worldwide belong to this species, and it is also the absolute mainstay of the specialty coffee world. In this article, Front Street Coffee will guide you through a systematic understanding of Arabica coffee's characteristics—from botanical classification to growing conditions, from flavor expression to its essential differences from Robusta, and introduce representative Arabica varieties one by one, including Typica, Geisha, Bourbon, Caturra, and SL28/34, helping you build a clearer understanding of coffee varieties.

Most of the coffee we drink day to day comes from the Arabica species, though people usually don't make a point of emphasizing it. The reason it's sometimes specifically called out is mainly to distinguish it from another species—Robusta coffee. Today, Front Street will walk you through the characteristics of Arabica coffee in detail.

Arabica belongs to the small-bean coffee species

The Arabica species (scientific name Coffea Arabica), often called small-bean coffee, originated in Ethiopia. Initially, Arabica coffee was used as a medicine; later, people gradually developed the practice of roasting and drinking it. In the 16th century, Arabs spread it around the world through trade, and only then did it slowly develop into the popular beverage it is today. Many of the specialty coffee beans we know well actually belong to the Arabica species, such as Jamaica Blue Mountain, Panama Geisha, and Ethiopia Yirgacheffe.

The Arabica plant is a relatively large shrub, best suited for cultivation in mountainous environments at altitudes of 600 to 2,200 meters (in Ethiopia, there are even cases of excellent quality grown at altitudes as high as 2,350 meters), with an ideal growing temperature of 15 to 24 degrees Celsius and annual rainfall of 1,200 to 2,200 millimeters. Its leaves are oval and dark green, and the fruit is also oval, typically containing two slightly flattened beans. The beans are round and plump, with a long oval shape when viewed from the front; the crack in the middle is narrow and curved, shaped like the letter S, while the arc on the back of the bean is relatively flat. Right next to Front Street's Dongshankou shop, two Arabica coffee trees are growing—you can take a look while you drink your coffee.

Arabica beans have a relatively low chlorogenic acid content, roughly between 5.5% and 8%. Chlorogenic acid not only acts as an antioxidant but is also an important component for resisting pests. Because of this, Arabica is more susceptible to pest damage and less adaptable to climate change. It usually needs to be planted at higher altitudes, produces fewer cherries, and matures more slowly, so its yield per hectare is lower than Robusta's. This makes Arabica's cultivation costs considerably higher.

The flavor expression of Arabica coffee

The bitterness we taste when drinking coffee mainly comes from chlorogenic acid in the coffee. Robusta has higher levels of caffeine, amino acids, and chlorogenic acid, so it inherently lacks the elegant, ethereal aroma of Arabica beans, replaced instead by a heavier, deeper bitterness. Arabica has lower caffeine content, only about 0.9% to 1.2%, but its fat content is 60% higher than Robusta's. Compared with the intensely flavored Robusta, Arabica has lower caffeine and twice the sugar content of Robusta, so it tastes softer and sweeter, with layered, complex acidity—which is why it has become the public's first choice.

As specialty coffee culture becomes more widespread, people have higher expectations for coffee's taste, mouthfeel, and quality, so only high-quality Arabica beans can better meet the demands of today's specialty coffee market. Many of the pour-over single-origin coffees on Front Street's bean list belong to the Arabica species, which also shows that, compared with Robusta, people prefer Arabica's pure flavors.

What are the common Arabica varieties?

As a broad category, Arabica can be subdivided into nearly three thousand varieties, all of which are derived from mutations that occurred after Ethiopia's oldest native varieties, Typica and Bourbon, spread to South America or Asia. As an agricultural crop, coffee's flavor is always closely tied to variety, climate, altitude, soil, management, and other factors; it is the truest expression of a variety and its local terroir. Below, Front Street has selected a few representative varieties to introduce.

Typica

Typica is Ethiopia's oldest native variety, discovered around the 15th to 16th century AD. It is characterized by a relatively tall coffee tree, bronze-colored young leaves at the top, and relatively large, elongated beans with pointed, upturned ends, somewhat resembling an egg in shape. Typica coffee usually has citrus-like acidity and a sweet finish, and many praise it as an elegant, clean coffee bean. Unfortunately, it has low yields and poor resistance to leaf rust, so farmers gradually replaced it with other, more robust varieties.

Typica was introduced to Jamaica in the 18th century by Sir Nicholas Lawes and soon after brought to the Blue Mountain region for cultivation, where it has now been grown for more than two hundred years. Blue Mountain Typica has also adapted to the local island tropical rainforest climate and evolved stronger disease resistance, especially against coffee berry disease, far surpassing ordinary Typica. Front Street believes that Blue Mountain coffee's refined, clean flavor owes much to Jamaica's insistence on carefully cultivating the Typica variety, allowing Typica to integrate with the local terroir; the Blue Mountain range's excellent terroir and unique microclimate are equally indispensable. Front Street uses a medium-dark roast to maximize the coffee's chocolate and nut aromas while preserving soft acidity and sweetness, bringing the overall taste into balance.

Geisha

Anyone who regularly drinks pour-over coffee must have heard of Panama Geisha. With its stunning aroma, it has become one of the bywords for contemporary specialty coffee. The Geisha variety is derived from Typica and also originates from Ethiopia, the birthplace of coffee.

Geisha is extremely demanding about its growing environment: it needs high altitude, fertile soil, and cloud cover or shading from other plants, and cannot be exposed directly to harsh sunlight. The owner of Hacienda La Esmeralda once said that the estate needs a large number of shade trees to shield the delicate Geisha from the sun, and that traditional pruning methods must be used in the early stages of planting, otherwise the plants die easily. The higher the altitude at which Geisha is grown, the longer the coffee cherries take to mature, and the more complex and unique the flavor expression. Unlike other coffee varieties, the leaf system of the Geisha coffee tree is very thin, which means photosynthetic efficiency is low; the roots are also fragile, and the absorption of water and nutrients is slow. As a result, coffee yields are very small, and combined with the high-altitude growing environment, the cherries also mature relatively late.

Today, Geisha is grown in many regions around the world and is the new king of specialty coffee. Among them, those produced in Latin American countries such as Panama, Guatemala, and Colombia are of higher quality, with Panama Geisha standing out as the cream of the crop. When it comes to Geisha coffee, the most popular one on Front Street's bean list is, of course, the famous Geisha produced by Hacienda La Esmeralda, which is further classified according to different characteristics into Red Label Geisha, Green Label Geisha, and Volcanic Rock Geisha. High-quality Geisha coffee has striking aromas of rose, citrus, berries, and honey, and is deeply loved by many coffee enthusiasts.

Bourbon

Bourbon arose from a natural mutation of Typica, with the bean shape changing from slender and pointed to round. It was first discovered on Bourbon Island (Reunion Island) off the east coast of Africa. In 1715, France transplanted round-beaned Mocha from Yemen to Bourbon Island off the east coast of Africa (renamed Reunion Island after the French Revolution), and it was only afterward that the name Bourbon came into being. Bourbon's round beans were introduced to Brazil in 1727 and began to be cultivated there.

Although its yield is not particularly high, compared with the frail Typica, Bourbon has stronger resistance to leaf rust. Grown at high altitudes, Bourbon coffee has a rich, delicate flavor, intense aroma, and soft acidity. The Bourbon cherries we usually see change color from green to slightly yellow, orange-yellow, red, and finally fully ripe dark red—this is the so-called Red Bourbon. There is also a relatively rare Yellow Bourbon, whose ripe cherries are bright yellow; Front Street's Brazil Queen Estate coffee belongs to the Yellow Bourbon variety.

Brazilian coffee mostly has lower acidity, and combined with the coffee's mellow aroma, it goes down very smoothly with a pleasant aftertaste. Front Street Coffee selected a semi-washed Red Bourbon as its representative Brazilian coffee; the flavor features pronounced nuts and chocolate, medium caramel sweetness, a smooth mouthfeel, and overall balance. Front Street has added it to its daily bean series. Front Street's daily beans are the flagship of each major producing region, presenting the region's basic flavor profile. Coffee beginners can use them to understand a region's foundational flavors, then choose according to their own preferences to explore different regional types in greater depth.

Caturra

Caturra arose from a natural mutation of Bourbon and was discovered in Brazil in 1937. The tree is relatively short, and its disease resistance is not high, but because it can be planted densely and has a higher fruiting rate, its yield is greater than varieties such as Bourbon, and it is widely cultivated in Central American countries. In terms of flavor, Caturra has bright acidity and a mouthfeel full of fruitiness; after medium-dark roasting, it shows the sweetness and fragrance of chocolate and nuts. It is a frequent champion in many coffee competitions.

Quite a few coffees on Front Street's bean list contain the Caturra variety. If you want to understand this variety's flavor characteristics, Front Street recommends the Colombia daily bean, which is a washed Caturra variety with very high cleanliness. Front Street aims to highlight the classic Colombian coffee flavor, using a medium-dark roast to present aromas of nuts, dark chocolate, and caramel.

SL28&SL34

During the period from 1935 to 1939, the Scott Laboratories gave all the coffee varieties they selected and bred the prefix SL. The laboratory selected 42 varieties from different origins and studied their yield, quality, drought resistance, and disease resistance. After numbering and screening them one by one, SL-28 and SL-34 were ultimately obtained. SL28 comes from the Bourbon genetic group; its beans are short and round, plump, and it has flavor characteristics of elevated acidity and pronounced sweetness.

SL34 comes from the Typica genetic group; its beans are oval and, viewed from the side, are not as plump as Typica varieties, appearing relatively flat. It has flavor characteristics of balanced, full acidity and sweetness and a caramel finish. Front Street's Kenya Asalia coffee beans are selected from these two varieties, using a 72-hour washed process, presenting rich acidity of plum, yellow sugar, smoked plum, and cherry tomato.

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