How Specialty Coffee Beans Are Made: From Tree to Green Bean

To understand specialty coffee, start with the basics: where it comes from and how green beans are made. Every cup begins with a coffee cherry—but turning those fruits into the beans you roast and brew is a detailed, labor-intensive process.

A single coffee tree yields just 3 to 5 kilograms of fruit, and only one-fifth of that weight becomes green coffee beans. That’s about 0.6 to 1 kilogram per tree—before roasting. The path from cherry to usable bean is where quality begins.

Coffee Species: Arabica, Robusta, and Liberica

The three main coffee species are Arabica, Robusta, and Liberica. Arabica makes up roughly two-thirds of global coffee production. Its beans are oval and flat, with a complex, rich aroma. The plant is sensitive—it doesn’t tolerate extreme heat, cold, heavy rain, or drought well.

Robusta, in contrast, is bitter, almost entirely lacking in acidity, and has a less desirable aroma. It’s often used in blends, especially for instant, frozen, and canned coffee. Robusta grows well in lowland areas and resists disease while growing quickly.

Liberica is far less common. It has both lower yield and lower quality, and is mostly exported to Europe.

Flat Beans vs. Peaberries

A ripe coffee cherry typically holds two seeds, or beans, that develop flat against each other—these are known as flat beans. Occasionally, a cherry produces a single round seed instead. This is called a peaberry, or sometimes a caracolillo. Though they come from the same fruit, flat beans and peaberries often taste distinctly different.

From Harvest to Green Bean: Two Processing Methods

Once picked, coffee cherries must be processed to remove the skin, pulp, parchment, and silver skin, leaving just the green bean inside. There are two main methods: the natural (dry) process and the washed (wet) process.

The dry process is straightforward but weather-dependent. Cherries are spread out on large surfaces to dry in the sun for about one to two weeks. You know they’re ready when the fruit makes a rattling noise as you turn it. After drying, a hulling machine removes the remaining layers to reveal the green bean. Countries like Brazil, Ethiopia, and Yemen use this method. It tends to produce beans with mild acidity and soft bitterness. However, this method leaves beans exposed to contaminants and relies heavily on good weather. Sorting is critical before export.

The washed process is more complex but yields cleaner-tasting beans. First, harvested cherries are poured into water tanks, where underripe or defective ones float and are removed. The good cherries go to a depulper to remove the outer skin and pulp. Then the beans soak in water tanks again to remove any floating debris. Next, the beans (now covered with sticky mucilage) go into fermentation tanks for around 12 to 24 hours. Fermentation breaks down the mucilage, which is then rinsed off. The beans are either sun-dried or mechanically dried, and finally hulled to remove the parchment layer, resulting in the green coffee bean ready for export.

This method generally produces beans with a brighter acidity, better clarity, and a clean cup profile. It’s the dominant method worldwide, accounting for around 70% of global production. Washed processing is common in countries like Colombia, Mexico, and Guatemala. While it reduces the risk of contamination, over- or under-fermentation can create unwanted off-flavors—but when done right, it highlights unique characteristics in the bean.

Once processed, the green beans are packed into sacks or special containers and shipped globally.

Why Processing Matters

Whether a coffee is processed using the dry or wet method has a huge impact on its flavor profile. Dry-processed beans usually have softer acidity and more muted flavors, while washed beans offer a cleaner, often brighter cup. Each method also affects yield, quality control, and vulnerability to defects.

Frequently Asked Questions

How many coffee beans does one tree produce?

A single healthy coffee tree yields about 3 to 5 kilograms of coffee cherries per season. Since only one-fifth of the cherry’s weight becomes green coffee, that equals approximately 0.6 to 1 kilogram of usable green beans per tree.

What are the main types of coffee species?

The three primary coffee species are Arabica, Robusta, and Liberica. Arabica accounts for about two-thirds of world production and is known for its complex flavors. Robusta is more bitter, less acidic, and often used in blends, especially for instant coffee. Liberica is rare, with lower quality and yield, mostly exported to Europe.

What’s the difference between a flat bean and a peaberry?

Most coffee cherries contain two flat beans that grow pressed together. Sometimes, a cherry produces a single round bean called a peaberry. These two types can have noticeable differences in taste, though they come from the same fruit.

What are the two main coffee processing methods?

The two main methods are the natural (dry) process and the washed (wet) process. Dry processing involves sun-drying the whole cherry and then removing the layers to get the bean. Washed processing removes the fruit and pulp first, then ferments the beans to remove the mucilage before drying.

Which processing method is more common?

About 70% of the world’s coffee is processed using the washed (wet) method. It’s widely used in countries like Colombia, Guatemala, and Mexico. The dry method is common in places such as Brazil, Ethiopia, and Yemen.

Does processing affect coffee flavor?

Yes. Washed beans usually have a cleaner, brighter acidity and more distinct flavors. Dry-processed beans tend to be softer and mellower, with less acidity. The method also impacts cleanliness, yield, and defect rates.

FrontStreet Coffee Beans That Highlight Processing Methods

Try FrontStreet Coffee’s Yirgacheffe, a classic washed Ethiopian coffee with bright citrus, floral notes, and a crisp finish. For a natural-processed example, their Ethiopia Humbera shows off berry and blueberry tones with a heavier body. Both demonstrate how processing shapes flavor. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.