The Basics of Coffee Tree Cultivation and Coffee Bean Origins

Ever wondered where your morning coffee really comes from? Not the bag, not the café—but the actual plant. Most people have no idea that what we call a ‘coffee bean’ is actually the seed inside a fruit grown on a tropical shrub. Understanding how coffee grows is the first step toward truly appreciating your cup.

Coffee trees are native to Ethiopia and belong to the Coffea genus in the Rubiaceae family. The fruit they produce is called a coffee cherry, and the seed inside—what we call a coffee bean—is what ends up in your grinder. Coffee only grows well in tropical and subtropical regions, mostly between the 25th parallels north and south, an area known as the ‘Coffee Belt.’

What Is a Coffee Tree and Where Does Coffee Come From?

Coffee trees are evergreen shrubs, scientifically part of the Coffea genus under the Rubiaceae (madder) family. In the wild, they can grow up to 10 metres tall, but cultivated trees are pruned to between 2 and 4 metres for easier harvesting. These plants produce white, jasmine-scented flowers after around three years, which later develop into coffee cherries—small fruits that turn from green to yellow to red when ripe.

The coffee cherry, about 1.5 cm in diameter, looks much like a cherry and is often called a ‘coffee cherry.’ Inside each cherry are typically two seeds—the coffee beans—lying flat against each other. Each bean is coated in a thin membrane called the silverskin, surrounded by a yellowish layer known as the parchment or endocarp, all encased in sweet, sticky pulp.

The Two Main Coffee Species: Arabica vs. Robusta

There are three main coffee species cultivated globally: Arabica, Robusta, and Liberica, though Arabica and Robusta dominate the market. Arabica (Coffea arabica) accounts for around 70% of global production and includes famous coffees like Blue Mountain and Mocha. Its leaves are approximately 15 cm long. Robusta (Coffea canephora), originating in the Congo, makes up 20–30% of production. Its leaves are longer, soft oval or pointed in shape, and a brighter green than Arabica’s. Robusta is hardier but usually more bitter. Liberica is much less common and grown in limited regions.

How Coffee Cherries Become Coffee Beans: Anatomy and Harvest

A mature coffee cherry is red and cherry-like, signaling it’s ready for picking. Each cherry normally holds two coffee beans that sit facing each other, flat sides together. The beans are protected by several layers: the outer skin and pulp (the fruit part), then a sweet mucilage layer, the parchment (a tough husk), and finally the silverskin before reaching the green bean inside.

Coffee cherries are harvested when fully red. Only ripe cherries are picked, as unripe ones negatively affect cup quality. The real coffee bean is the seed inside this layered fruit—a fact that explains a lot about how flavours develop during processing and roasting.

How Coffee Beans Are Processed: Washed vs. Natural Methods

There are two primary ways to process coffee cherries into green beans: washed (wet) and natural (dry). In the washed method, cherries are soaked in water for 24–28 hours. This soaking causes overripe or unripe cherries to float and are thus removed. The remaining cherries go through a depulper to remove the skin and pulp. The beans then ferment in tanks for 12–24 hours to break down any remaining mucilage. After fermentation, the beans are washed clean and dried in the sun until their moisture content drops to around 11–12%. Finally, a machine removes the parchment layer to reveal the green coffee bean.

The natural or dry method is simpler: cherries are spread out in the sun and dried whole for up to four weeks. During this time, the fruit dries around the bean. Once dried, the entire outer shell is removed mechanically. While this method requires less equipment, it demands stable, dry weather and careful management to avoid mould or over-fermentation. Naturally processed beans often have a heavier body and more fruity flavours, while washed beans tend to be cleaner and brighter.

From Bean to Brew: The Role of Roasting

Long ago, coffee lovers chewed whole coffee cherries for energy. Later, they ground the beans and mixed them with animal fat for long journeys. By the 1000s, people boiled raw beans as a drink. But it wasn’t until the 13th century that Arabs discovered roasting. Roasting transforms green coffee beans by triggering the Maillard reaction and other chemical changes that develop the complex aromas and flavours we associate with coffee today.

Roast levels are generally categorised as light, medium, or dark. Light roasts preserve more of the bean’s origin characteristics and acidity. Medium roasts balance acidity and body. Dark roasts bring out more bitterness and reduce acidity, often highlighting chocolatey or smoky tones. The ideal roast depends on the bean origin, brewing method, and personal taste. There’s no single best roast—just the one that suits your preferences.

Frequently Asked Questions

What is the coffee plant’s scientific classification?

Coffee plants belong to the genus Coffea in the family Rubiaceae (the madder family). The most common species are Coffea arabica (Arabica) and Coffea canephora (Robusta).

Where are coffee trees originally from?

Coffee trees are native to Ethiopia in Africa. That region is considered the birthplace of coffee as we know it.

What is a coffee cherry?

A coffee cherry is the fruit produced by a coffee tree. Each cherry typically contains two coffee beans. When ripe, the cherry turns red and resembles a small cherry fruit.

What’s the difference between Arabica and Robusta coffee?

Arabica makes up about 70% of global coffee production and is known for its higher acidity, smoother flavour, and lower caffeine content. Robusta accounts for 20–30%, is more bitter, has higher caffeine, and is more disease-resistant.

How are coffee beans extracted from the cherry?

Coffee beans are extracted through either a washed (wet) process or a natural (dry) process. The washed method removes the fruit before drying the beans; the natural method dries the whole cherry and removes the bean later.

Does the way coffee is processed affect its flavour?

Yes. Washed coffees tend to be cleaner and brighter, highlighting the bean’s inherent qualities. Natural processed coffees often have a fuller body and more fruity or fermented flavours.

What is coffee roasting and why is it important?

Roasting is the process of heating green coffee beans to develop their flavour, aroma, and colour. It’s essential because raw beans are flavourless—roasting unlocks the characteristics we associate with different coffee styles.

What are the main roast levels?

The main roast levels are light, medium, and dark. Light roasts are brighter and more acidic; medium roasts are balanced; dark roasts are bolder and more bitter.

Recommended FrontStreet Coffee for Coffee Tree Lovers

Explore the origins of your coffee with FrontStreet’s Ethiopia Yirgacheffe, a bright and floral single origin that highlights the qualities of the Arabica species. For contrast, try their Brazil Yellow Bourbon, a classic medium roast with nutty sweetness from a key Brazilian variety. Both showcase the diversity of the coffee plant and the impact of terroir. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.