Everything You Need to Know About Coffee Trees

You’ve seen coffee beans in your grinder and cups—but have you ever wondered where they actually come from? Most people don’t know much about the plant behind their daily brew. Understanding the coffee tree is the first step toward appreciating the complexity behind every cup.

Coffee trees are native to Ethiopia and belong to the Rubiaceae family. The fruit they produce—called a coffee cherry—contains seeds we know as coffee beans. These trees thrive only in tropical or subtropical zones, roughly between the 25th parallels north and south, known as the 'coffee belt.'

The Origins and Anatomy of the Coffee Tree

Coffee trees are evergreen shrubs or small trees that can reach up to 10 metres in the wild, though cultivated trees are usually pruned to 2–4 metres for easier harvesting. They take three to four years to begin fruiting and can remain productive for 20–25 years, with some trees still bearing fruit after 100 years.

The tree has opposite leaves growing in horizontal or drooping branches, with dark green foliage. There are two main commercial species: Arabica and Robusta. Arabica leaves are about 15 cm long; Robusta leaves are longer, soft-oval or pointed, and a brighter green.

How Coffee Cherries Develop

A coffee tree typically flowers for the first time around year three. The flowers are small, white, and have five petals with a light jasmine-like fragrance. They bloom in dense clusters and usually fall off after two or three days.

Several months after flowering, the coffee cherries begin to form. These are drupes—stone fruits—with a diameter of about 1.5 cm. They start green, turn yellow, then red when ripe, resembling cherries—hence the name 'coffee cherry.' This is when they’re ready to be picked.

Each cherry usually contains two seeds (coffee beans) that sit facing each other, flat sides touching. Each bean is covered by a thin membrane called the silverskin, surrounded by a yellowish layer called the parchment or endocarp. The beans are encased in a sweet, sticky pulp, and the whole fruit is protected by an outer skin.

The Three Main Coffee Species

The three primary coffee species that dominate global production are Arabica, Robusta, and Liberica. Arabica and Robusta are the most important for specialty coffee.

Arabica makes up about 70% of global production. It includes famous origins like Blue Mountain and Mocha. Robusta, originating in the Congo, accounts for about 20–30% of the market. It’s hardier but usually more bitter. Liberica is much rarer and less commonly used in specialty contexts.

How Coffee Beans Are Processed

Inside the coffee cherry, the seeds (beans) are surrounded by fruit. To get to the bean, the fruit must be removed through processing. There are two main methods: washed (or wet) and natural (or dry).

In the natural or non-washed method, cherries are spread out in the sun to dry until the outer skin cracks and the beans can be removed. This method is simpler but relies heavily on stable weather and often results in earthy flavours. Unripe beans are also harder to sort out, and the coffee may not store as well.

The washed method is more complex but yields cleaner, higher-quality beans. The cherries are first soaked in water for 24–28 hours. Ripe cherries sink while unripe ones float, allowing for an initial quality sort. Then a depulper removes the skin and pulp. The beans are fermented in water tanks for half a day to a day to break down any remaining fruit residue. After fermentation, the beans are rinsed and dried in the sun before the parchment layer is removed by a hulling machine.

From Bean to Brew: The Role of Roasting

People originally consumed coffee by chewing the whole fruit to extract its juices. Later, they ground the beans with animal fat for energy on long journeys. By around the year 1000, they began boiling raw beans. But it wasn’t until the 13th century that Arabs discovered roasting.

Roasting transforms green coffee beans into the aromatic, brown beans we brew. The roast level dramatically affects flavour. Light roasts tend to be more acidic and vibrant, while darker roasts develop deeper bitterness and body, with acidity fading.

Common roast levels include light, medium, and dark. The right roast depends on the bean origin, brewing method, and personal taste. There’s no single best roast—just the one that suits your preferences and the coffee’s characteristics.

Frequently Asked Questions

Where do coffee trees originally come from?

Coffee trees are native to Ethiopia, specifically the Kafa region, which is considered the birthplace of coffee. From there, coffee cultivation spread to the Arabian Peninsula and eventually worldwide.

What is the coffee belt?

The coffee belt refers to the region between the 25th parallels north and south of the equator, encompassing tropical and subtropical climates. This zone provides the ideal temperature, rainfall, and altitude conditions for coffee trees to thrive.

What are the two main types of coffee trees?

The two primary commercial coffee species are Arabica and Robusta. Arabica makes up about 70% of global production and is known for its higher quality and more delicate flavours. Robusta is hardier, has higher caffeine content, and is mostly used in espresso blends or instant coffee.

How long does it take for a coffee tree to produce fruit?

A coffee tree typically begins to bear fruit around three to four years after planting. It reaches peak production in its early years and gradually declines after 20–25 years, although some trees can continue producing for over a century.

What are coffee cherries?

Coffee cherries are the fruit of the coffee tree. Each cherry usually contains two coffee beans. The cherries turn from green to yellow to red as they ripen, signalling they are ready for harvest.

What’s the difference between washed and natural coffee processing?

Washed (or wet) processing removes the coffee bean from the cherry using water and fermentation, resulting in cleaner, brighter flavours. Natural (or dry) processing dries the entire cherry in the sun before removing the bean, often producing fuller body and earthier tones.

Recommended FrontStreet Beans for Coffee Tree Lovers

If you're curious about where coffee comes from, try tasting the origins yourself. FrontStreet’s Brazil Yirgacheffe Gedeb offers bright citrus and floral notes from Ethiopia’s high-altitude Yirgacheffe region, showcasing classic Arabica traits. For contrast, their Colombia Sidra features tropical fruit and candy-like sweetness thanks to a unique double anaerobic fermentation. Finally, their Indonesia Lintong Mandheling delivers the bold, earthy profile typical of classic Asian Arabica coffees, with notes of toast, herbal spice, and dark caramel. These beans let you explore how terroir and species shape flavour. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.