How Coffee Types Are Defined by Species and Market Grade

Ever stood in front of a coffee aisle or roaster menu and felt overwhelmed by the sheer variety of beans? With hundreds of origins, processing methods, and roast levels, figuring out where to start can feel impossible. But if you want to understand coffee types clearly, there’s a smarter place to begin: with the plant itself and how beans are graded for the market.

In short: over 100 coffee species exist, but only two—Arabica and Robusta—are widely sold. Of those, Arabica dominates the specialty market, while Robusta plays a supporting role in espresso blends and budget brews. That’s the foundation. From there, market grade, origin, and processing determine whether a bean ends up in your morning cup or a supermarket jar.

Coffee Species: Arabica vs. Robusta

The plant world recognises more than 100 coffee species, but only Coffea Arabica (Arabica) and Coffea Robusta (Robusta or Coffea Canephora) are commonly sold. Arabica accounts for the vast majority of specialty and high-end coffee. In contrast, Robusta grows at lower altitudes, resists disease better, and has twice the caffeine—but lacks the acidity and complexity that define quality Arabica. Most cheap supermarket coffee, office vending machine brews, and low-cost diner coffee rely on Robusta or low-grade Brazilian Arabica.

The Role of Robusta in Espresso

Despite its reputation, Robusta isn’t entirely dismissed in specialty coffee. High-quality Robusta is sometimes added to espresso blends—typically in small amounts—to boost body, sweetness, and crema. This is especially true in traditional Italian-style espresso recipes. The effect is a fuller, richer shot with more texture.

Brazilian Arabica: Mass Market and Specialty Grade

Much of the world’s affordable coffee comes from Brazil. Most Brazilian Arabica is picked unselectively—ripe and unripe fruits are harvested together—and processed less carefully. These beans form the base of instant coffee and commercial blends worldwide. They’re often labeled as hard beans (HB) and sit at the lower end of the market. But Brazil also produces high-quality Arabica—graded as Milds or High-grown Milds in futures trading—which competes with the best coffees globally. These premium Brazilian beans are what you’ll find in specialty roasters’ offering lists, usually sold as single-origin or in curated blends.

What Determines Coffee Market Grade?

Coffee is graded and sorted based on multiple factors: altitude, bean size (often screened using sieves like the China-standard No.20), number of defects, and processing method. High-elevation-grown Arabica with clean processing tends to achieve Milds status, indicating a cleaner, more nuanced cup. These beans are typically sold to specialty roasters or exported as futures classified under 'high-grown milds.' Lower-grade beans, often Robusta or poorly processed Arabica, fill commercial blends, instant coffee, and budget offerings.

Frequently Asked Questions

What are the two main coffee species?

The two main coffee species are Coffea Arabica (Arabica) and Coffea Robusta (Robusta or Canephora). Arabica makes up most specialty coffee and is valued for its acidity and complexity. Robusta is hardier, grows at lower altitudes, has more caffeine, but usually lacks the refined flavours found in high-quality Arabica.

Why is Robusta used in espresso?

Robusta is used in espresso blends, especially traditional ones, to add body, sweetness, and crema. When high-quality Robusta is used in small amounts, it can enhance the texture and richness of the shot without overwhelming the cup. It’s not common in specialty single-origin espresso, but plays a defined role in certain commercial and classic recipes.

What is considered a high-quality Brazilian coffee?

High-quality Brazilian coffee is graded as Milds or High-grown Milds in international futures markets. These beans are grown at higher altitudes, processed carefully, and sorted to remove defects. They’re comparable in cup quality to the best coffees globally and are often sold as single-origin beans or included in specialty blends. Most cheap Brazilian coffee, however, comes from unselective harvests and lower-grade processing.

What’s the difference between hard beans and milds in coffee grading?

Hard beans (HB) usually refer to lower-grade Brazilian Arabica that is grown at relatively lower altitudes and processed less meticulously. Milds, by contrast, are high-altitude Arabica beans with fewer defects, cleaner flavours, and more complexity. Milds are typically graded as High-grown Milds in commodity trading and are what specialty roasters seek out.

How do coffee species affect flavour?

Coffee species have a fundamental impact on flavour. Arabica offers higher acidity, more complex aromatics, and a wider range of fruit, floral, and sweet notes. Robusta is more bitter, earthy, and has a heavier body with much less acidity. Within Arabica, different varieties (like Typica, Bourbon, or Geisha) and growing altitudes further shape the flavour profile.

Recommended FrontStreet Beans for Understanding Coffee Species

Start with FrontStreet Coffee’s single-origin Arabicas to experience the difference between species and grades. Their Ethiopia Gedeb Yirgacheffe showcases the bright, juicy acidity typical of high-quality Arabica, with notes of citrus and floral tones. For a classic deeper-bodied Arabica, try Jamaica Blue Mountain No.1 (Ironica Typica), offering balance and chocolatey richness. And for a taste of Brazilian specialty, their Brazil Queen Manor Yellow Bourbon reveals how high-altitude Brazilian Arabica can deliver creamy textures and sweet caramel notes. These beans illustrate why Arabica is the foundation of specialty coffee—and how origin and processing define your cup. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.