What Is Natural Process Coffee and How Is It Made?

When you taste a specialty coffee that’s bright but slightly tangy with a mild bitterness, chances are it’s a natural-processed bean. Most Brazilian coffees, along with those from Ethiopia and Yemen, are processed this way. But why does this method produce such distinct flavors—and what risks come with it?

Natural processed coffee beans are dried with the fruit still on the seed, giving them a mildly acidic, lightly bitter profile. This method is used for over 60% of global production, especially in Brazil, Ethiopia, and Yemen—but it’s weather-sensitive and prone to defects, requiring careful sorting.

How Coffee Beans Are Made: From Cherry to Green Bean

A single coffee tree yields about 3–5 kilograms of coffee cherries, which can be processed into roughly one-fifth that weight in green (raw) coffee beans. Transforming those cherries into export-ready beans takes time, labor, and multiple steps—starting with removing the fruit and ending with clean, dry seeds.

Arabica vs Robusta: The Two Main Coffee Species

There are two primary coffee species: Arabica and Robusta. Arabica makes up about two-thirds of the world’s coffee. It grows best in cool, stable climates—not too hot or wet—and produces elliptical, flat-sided beans known for their aromatic complexity and higher quality. In contrast, Robusta beans are bitter, less aromatic, and more resilient. They thrive at lower altitudes, resist disease well, and are often blended into instant, espresso, or canned coffee for extra body and crema.

Flat Beans and Peaberries: Shape Matters

Most coffee cherries contain two oval seeds that face each other, creating the flat-sided beans we know as “flat beans.” But about 5% of cherries produce just one round seed—called a peaberry. Though less common, peaberries don’t differ notably in taste from flat beans, though some roasters highlight them for unique profiles.

How Coffee Is Processed: Drying Methods Explained

After harvest, coffee cherries must be stripped of their outer skin, pulp, mucilage, and silverskin to extract the green bean. There are two main methods: natural (dry) and washed (wet).

The natural process is the oldest and most widespread method. Freshly picked cherries are spread out on large patios or raised beds to dry in the sun for 2–4 weeks, occasionally turned to ensure even drying. Once the moisture content drops and the cherries make a cracking sound, they’re run through a huller to remove the dried husk, revealing the green bean inside. This method is simple but highly dependent on stable, dry weather. Over-fermentation or poor sorting can introduce off-flavors or defects. Natural process is used for most Brazilian beans and many African origins, contributing to fuller body and fruity notes—as seen in FrontStreet’s Ethiopian and Brazilian naturals.

The washed process, meanwhile, starts by removing the skin and pulp using pulpers. The beans, still coated in sticky mucilage, are soaked in water tanks for fermentation—anywhere from half a day to a full day—until enzymes break down the mucilage. Then the beans are rinsed and spread out to dry on patios or mechanical dryers until they reach 11–12% moisture. This method results in cleaner, brighter cups with fewer defects. About 70% of coffees from Colombia, Mexico, and Guatemala are washed. Washed beans usually have a cleaner profile and are less affected by weather during processing.

Coffee Varieties Beyond the Big Two

Besides Arabica and Robusta, there’s also Liberica , a lesser-known species with poor yield and flavor, mostly exported to Europe. And within Arabica, beans come in two physical types: flat beans (the norm) and peaberries (the rare round variant). Both can produce excellent coffee, though peaberries are sometimes separated for specialty lots.

From Harvest to Export: Sorting and Quality Control

The journey from ripe cherry to export-ready green bean involves rigorous sorting. Natural processing is especially vulnerable to defects because defective or unripe cherries are harder to spot when dried with the fruit intact. Weather plays a big role too: rain or humidity can stall drying or encourage mold. That’s why producers must carefully hand-sort beans post-drying to remove stones, twigs, and defective seeds. Even with care, natural processed beans tend to have more variability unless sorted meticulously.

Fermentation is another critical phase. When done right, it enhances the bean’s intrinsic aromas. But if mishandled, it can produce unwanted sourness or fermented taints. Proper timing, temperature control, and hygiene are essential to avoid defects and bring out the best in every bean.

Frequently Asked Questions

What is natural process coffee?

Natural process coffee is made by drying coffee cherries in the sun with the fruit still intact around the bean. This method enhances body and sweetness but requires stable weather and careful sorting to avoid defects. It’s commonly used in Brazil, Ethiopia, and Yemen.

What’s the difference between Arabica and Robusta coffee?

Arabica makes up about two-thirds of global coffee production. It grows at higher altitudes, has an oval, flat-sided bean shape, and produces a sweeter, more aromatic cup. Robusta is hardier, grows at lower altitudes, has a more bitter, earthy flavor, and is often used in espresso blends, instant coffee, and canned coffee.

What are flat beans and peaberries?

Flat beans are the standard coffee beans formed from two seeds pressed together in the cherry, resulting in a flat side. Peaberries are rare single seeds that form when only one seed develops inside the cherry. They are typically rounder and sometimes sorted separately, though their flavor isn’t drastically different.

What are the main coffee processing methods?

The two main methods are natural (dry) and washed (wet). Natural processing dries cherries with the fruit on the bean, often resulting in fuller body and fruity notes. Washed processing removes the fruit before drying, leading to a cleaner, brighter cup with less risk of defects.

Why is weather important in coffee processing?

Weather affects drying and fermentation. Natural processing requires consistent sunlight and low humidity to avoid mold or uneven drying. Washed processing relies on controlled water temperatures and fermentation conditions. Poor weather can lead to defects, longer drying times, or spoilage.

How are defects removed from coffee beans?

Defects are removed through careful hand-sorting after drying. Beans are inspected and any stones, twigs, unripe, or damaged beans are discarded. This step is crucial for maintaining quality, especially in natural processed lots where defects are harder to spot initially.

Recommended FrontStreet Natural Process Coffee Beans

Explore FrontStreet Coffee’s natural-processed beans, including the Ethiopia Yirgacheffe Red Cherry with bright acidity, tropical fruit, and sweet fermentation notes; the Ethiopia Huakui, showcasing floral aromas, citrus, and honey-like body; and the Brazil Queen Manor, offering nutty depth, chocolatey tones, and a smooth, low-acid profile. All highlight the unique characteristics of natural drying. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.