Coffee beans are responsible for the flavors, aromas, and character we experience in every cup of coffee. Despite their familiar name, however, coffee beans aren’t actually beans at all. They’re seeds found inside the fruit of the coffee plant, commonly called a coffee cherry.
Before roasting, these seeds are known as green coffee beans. Their variety, growing conditions, processing method, roasting, and freshness can all influence how the finished coffee tastes. Two species—Arabica and Robusta—dominate commercial coffee production, but even coffees from the same species can taste remarkably different depending on where and how they’re grown.
From organic coffee beans and single-origin coffees to decaf and specialty varieties, there’s much more to these small seeds than meets the eye. Here are 15 interesting coffee bean facts that explain what happens before your morning coffee reaches the cup.
- Also see green coffee beans.
15 Interesting Facts About Coffee Beans
1. Coffee Beans Are Actually Seeds
Despite their name, coffee beans are seeds, not botanical beans.
Coffee plants produce fruits commonly called coffee cherries. Inside a typical cherry are two seeds positioned against each other. Those seeds are removed from the fruit, processed, dried, and eventually roasted to become the familiar brown coffee beans used for brewing.
Occasionally, a coffee cherry develops only one rounded seed instead of two. This is commonly called a peaberry.
2. Coffee Beans Are Green Before They’re Roasted
Before coffee beans turn brown in a roaster, they are generally pale green or greenish in appearance.
These green coffee beans contain chlorogenic acids and many other naturally occurring compounds. Roasting significantly changes their chemical composition, including reducing chlorogenic acids while producing new compounds responsible for much of roasted coffee’s familiar flavor and aroma.
3. Arabica and Robusta Dominate Commercial Coffee
There are numerous species within the Coffea genus, but two are overwhelmingly important to the commercial coffee market: Coffea arabica (Arabica) and Coffea canephora (Robusta).
Arabica is generally associated with more delicate and varied flavor profiles, while Robusta typically contains more caffeine and is often described as stronger or more bitter. Robusta is also widely used in espresso blends and instant coffee.
The International Coffee Organization identifies Arabica and Robusta as the two principal commercially important coffee species.
4. Growing Conditions Can Change Coffee’s Flavor
Where coffee grows can have a major influence on the finished cup.
Elevation, temperature, rainfall, soil, shade, coffee variety, and farming practices can all affect how coffee cherries develop. At higher elevations, cooler temperatures can slow fruit development, which can contribute to dense beans and complex flavors.
However, altitude alone doesn’t determine quality. The variety of coffee, local climate, processing, roasting, and brewing all contribute to what you eventually taste.
5. Roasting Completely Transforms Green Coffee Beans
Green coffee doesn’t look, smell, or taste like the roasted coffee most people recognize.
During roasting, heat causes a complex series of physical and chemical changes. The beans lose moisture, change color, expand, and develop hundreds of aroma and flavor compounds.
Reactions including the Maillard reaction play an important role in producing the characteristic aromas and flavors associated with roasted coffee.
Light, medium, and dark roasts can therefore taste quite different even when they begin with the same green coffee.
6. Coffee Can Naturally Taste Like Fruit, Chocolate, or Flowers
A bag of coffee described as having notes of chocolate, berries, citrus, nuts, or flowers doesn’t necessarily contain those ingredients.
Coffee naturally contains many aromatic and flavor compounds. Variety, growing conditions, processing, roasting, and brewing can create sensory characteristics that remind drinkers of familiar foods and aromas.
That’s why one coffee might seem bright and citrusy while another tastes nutty, chocolatey, or floral.
7. Whole Coffee Beans Don’t Stay Fresh Forever
Roasting creates many of the aromas people love about coffee, but those aromas don’t last indefinitely.
Once roasted coffee is exposed to oxygen, its aromatic compounds gradually change or dissipate. Grinding greatly increases the coffee’s exposed surface area, which is one reason whole beans generally retain their desirable aromas longer than pre-ground coffee.
For better freshness, store roasted coffee in an airtight container away from excessive heat, light, moisture, and strong odors.
8. Robusta Usually Contains More Caffeine Than Arabica
One important difference between Arabica and Robusta is caffeine content.
Robusta generally contains considerably more caffeine than Arabica. Caffeine is part of the coffee plant’s natural chemical defenses and can help deter some insects and other herbivores.
The higher caffeine content also contributes to some of the sensory differences associated with Robusta coffee.
9. Arabica and Robusta Beans Often Look Different
Although appearance varies, Arabica and Robusta beans often have recognizable physical differences.
Arabica beans tend to be more elongated or oval and commonly have a curved center groove. Robusta beans are often smaller and rounder with a straighter center groove.
Appearance alone isn’t a perfect way to identify every coffee bean, but the differences can be noticeable when the two are compared side by side.
10. Moisture Matters Before Coffee Is Roasted
Moisture content is an important consideration when storing and evaluating green coffee.
Too much moisture can increase the risk of deterioration during storage, while overly dry coffee can also lose quality. Coffee professionals therefore monitor moisture and storage conditions before beans ever reach the roasting stage.
Proper storage helps protect green coffee from excessive moisture, heat, contamination, and unwanted odors.
11. Organic Coffee Must Meet Specific Standards
In the United States, coffee sold as USDA Organic must meet federal organic production and certification requirements.
Organic crop production relies primarily on approved cultural, biological, and mechanical practices. Synthetic substances are generally prohibited unless specifically permitted on the USDA’s National List, while certain natural substances can also be prohibited.
You can learn more from the USDA Organic Standards.
It’s also important to remember that “organic” describes particular production and certification standards. It does not automatically mean a coffee will taste better than a conventionally produced coffee.
- Also see Organic Coffee.
12. Processing Methods Can Change the Flavor
Removing coffee seeds from the harvested fruit isn’t always done the same way.
Three terms you’ll frequently encounter are:
Washed process: Much of the fruit is removed before the coffee is dried. Washed coffees are often associated with cleaner, clearly defined flavors.
Natural process: The coffee cherries are dried with the fruit surrounding the seeds. This method can produce pronounced fruit-forward characteristics.
Honey process: Some of the sticky fruit material, or mucilage, remains on the seed during drying.
Processing doesn’t create exactly the same flavor in every coffee, but it can have a substantial influence on the final sensory profile.
13. Specialty Coffee Is About Distinctive Attributes and Value
You may have heard that specialty coffee simply means coffee scoring at least 80 points. That description reflects a widely used historical grading approach, but the Specialty Coffee Association (SCA) now uses a broader definition.
The SCA describes specialty coffee in terms of distinctive attributes that give the coffee or coffee experience additional marketplace value. Its Coffee Value Assessment considers physical, sensory, affective, and informational attributes rather than relying solely on one overall number.
Learn more from the Specialty Coffee Association.
14. Single-Origin Coffee Can Showcase Where It Came From
Single-origin coffee identifies coffee from a particular origin rather than a blend assembled from multiple origins.
Depending on the producer and seller, that origin might refer to a country, region, cooperative, estate, or individual farm.
Coffee lovers often seek single-origin beans because they provide an opportunity to experience characteristics associated with a particular variety, growing environment, processing method, and producer.
Blends serve a different purpose: roasters can combine coffees to create a particular flavor profile or maintain greater consistency throughout the year.
15. Geisha Is One of Coffee’s Most Celebrated Varieties
Geisha (also spelled Gesha) has become one of the best-known names in specialty coffee.
The variety has roots in Ethiopia and later became particularly famous through coffees grown in Panama. Exceptional examples are often recognized for floral and tea-like characteristics and have attracted considerable attention in specialty coffee competitions and auctions.
But Geisha isn’t automatically the “best coffee bean.” Taste is subjective, and excellent coffee can come from many varieties, regions, and processing styles.
Choosing the Best Coffee Beans for You
There isn’t one universal best coffee bean for everyone. The better choice depends on the flavors you enjoy and how you prepare your coffee.
Someone who likes bright, floral coffee might prefer a light-roasted single-origin Arabica, while someone who enjoys a heavier espresso may prefer a darker roast or a blend containing Robusta.
Freshness also matters. When possible, look for coffee with useful information about its origin, roast, processing, and roast date rather than judging quality solely by marketing terms.
And coffee beans aren’t limited to brewing. Chocolate covered coffee beans combine roasted coffee beans with chocolate for a crunchy snack, while decaf coffee beans undergo a decaffeination process before roasting to remove most of their caffeine.
Ultimately, understanding where coffee comes from and how it’s processed can make choosing and brewing it much more interesting. From green seed to roasted bean, every step helps shape the aroma, flavor, and character that eventually reaches your cup.