Introduction to the Three Major Types of Coffee Beans: What Are the Main Components and Their Functions?

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FrontStreet Coffee: Introduction to the Three Major Types and Components of Coffee

The coffee we drink daily comes mainly from two species: Arabica or Robusta. Liberica rarely appears on the market because its production is so low. Instant coffee is made primarily from Robusta, while high-quality coffee comes from Arabica. Much of the coffee we drink every day is a blend of the two. Beyond that, Arabica has many subspecies, each with its own flavor signature — Pacamara and Geisha, for example, both star performers at recent Cup of Excellence (COE) competitions, are Arabica varieties.

The varieties available on the market are mainly Arabica or Robusta, and each has its own characteristics, strengths, and weaknesses.

Arabica

The main producing countries are in Latin America. The flavor is balanced and mellow, and the caffeine content is low — typically only 1–1.3%. Different estates can create diverse flavor profiles under different growing conditions, which is why Arabica is the source of all specialty coffee. The catch is that it is demanding to grow: it needs high altitudes with wide temperature swings, ample water, and long maturation. Yields are lower than other varieties and it is susceptible to leaf rust. Most of its subspecies cannot tolerate direct sunlight, all of which drives up production costs.

Arabica has two ancient native varieties: Typica and Bourbon.

Typica is the original coffee variety, originating from Ethiopia — every Arabica variety descends from it.

Typica's new leaves at the branch tips are bronze-colored, and the beans are mostly oval or slender and pointed. Its flavor is elegant, but unfortunately the plant is physically weak and disease-prone, so production is limited. Jamaica Blue Mountain, Sumatra Mandheling, and Hawaiian Kona all belong to this variety.

Robusta

Robusta was discovered in Congo in 1898; its botanical name is Coffea Canephora, though we commonly just call it robusta coffee. Its flavor is ordinary and its caffeine content high. But because the plant is hardy and easy to grow, it is inexpensive, and it is often used in blends to control costs. Some regions specialize in Robusta for geographic and climatic reasons — Vietnam, for instance, where traditional Vietnamese coffee is made primarily from Robusta beans.

Knowledge Extension

Most people believe Bourbon arose as a natural mutation after Typica was transplanted to Yemen. Its beans are rounder in shape. In 1715, France moved the variety from Yemen to Bourbon Island off the east coast of Africa — hence the name.

In summary: FrontStreet Coffee is a coffee research center that enjoys sharing coffee knowledge with everyone. We share without reservation simply because we want more friends to fall in love with coffee. Additionally, we hold three discounted coffee events each month because FrontStreet Coffee wants to provide the best coffee at the lowest prices to more friends. This has been our mission for the past six years!

FrontStreet Coffee Recommendation

Of all the Arabica varieties mentioned above, Geisha deserves special attention. Transliterated from "Geisha/Gesha," it is one of the most beloved varieties in specialty coffee, famous for its unique florals and superb sweet-tart character — and, because of low yields, weak disease resistance, and demanding cultivation, famous for its price as well. Knowing the tiers helps you buy well.

Panama is where Geisha made its name. Hacienda La Esmeralda discovered the variety and entered it in the 2003 Best of Panama competition, stunning the judges and taking the crown with an average cupping score of 94.6 — a BOP record. Its Red Label ("Esmeralda Special") grows at 1,600–1,800 m, must cup above 90 points, and comes from single named plots such as Jaramillo, while the more affordable Green Label ("Private Collection") blends batches from multiple plots to express the estate's signature high-altitude Geisha profile. For a first taste of the legendary flavor, FrontStreet Boquete Geisha is the entry-level pick: classic Panamanian orange-blossom sweetness, oolong-tea texture, delicate fruit acidity, and clearly layered structure.

Ethiopia, Geisha's birthplace, offers its own expressions. Geisha Village estate, founded 12 miles from the Gori Gesha forest, grows three varieties (Gori Gesha, Geisha 1931, and Illubabor Forest) across Gold Label, Red Label, Green Label, and Chaka tiers — the Gold Label Geisha 1931 accounts for just 10% of production and is frequently chosen by competition baristas. FrontStreet Granana Estate Gesha, from a 2014-established station near Kochere, is roasted medium-light to show bright citrus acidity, elegant ginger-flower aroma, and ripe fruit sweetness. To brew, use a coarse grind (78% pass through #20 sieve), 91°C water, 15 g of coffee at 1:16 in a V60 with three pours; as a medium-roast SOE it pulls shots of dried apricot, caramel, and nuts.