What Is a Coffee Tree? The Origins and Types of Coffee Plants

If you’ve ever sipped a pour-over or enjoyed an espresso, you’ve likely never wondered where the coffee inside actually comes from. But every coffee bean begins life on a tree—specifically, a tropical evergreen that produces a fruit resembling a cherry. Understanding the coffee tree helps explain why certain beans taste the way they do, where your coffee is grown, and what limits coffee farming to just a slice of the planet.

Coffee trees are native to Ethiopia and belong to the Rubiaceae family, genus Coffea. What we call a ‘coffee bean’ is actually the seed inside the tree’s fruit—not a true bean. These seeds grow inside bright red berries, often called coffee cherries, and require very specific growing conditions to thrive.

Where Do Coffee Trees Come From?

Coffee trees originated in the highlands of Ethiopia, Africa. Botanically, they are classified as evergreen shrubs or small trees in the Coffea subgenus of the Rubiaceae (madder) family. The part we call a coffee bean is the seed found within the tree’s fruit. Though shaped like a bean, it’s biologically a seed. The fruit itself resembles a cherry—hence the common term ‘coffee cherry.’

The Ideal Climate and Geography for Coffee Trees

Coffee trees grow only in tropical or subtropical regions, specifically between the latitudes of 25° north and 25° south. This band around the equator is known as the ‘coffee belt’ or ‘coffee zone.’ Within this zone, the climate provides the consistent warmth, moderate rainfall, and seasonal dry periods that coffee trees need to flower and fruit properly.

What Does a Coffee Tree Look Like?

A mature coffee tree can reach up to 10 metres in the wild, but cultivated trees are usually pruned to stay between 2 and 4 metres tall for easier harvesting. The tree has oval-shaped leaves that grow opposite each other on short stems. Depending on the variety, flowers are small, white, and fragrant with a jasmine-like scent. They typically appear when the tree is around three years old. After flowering, it takes several months for the coffee cherries to develop and ripen.

The Two Main Coffee Species: Arabica vs Robusta

There are over 100 coffee species, but only a few are widely cultivated. The three primary commercial species are Arabica, Robusta, and Liberica. Of these, Arabica and Robusta dominate the global market.

• Arabica (Coffea arabica): Accounts for about 70% of global production. Arabica beans are known for their nuanced flavours, acidity, and aromatic complexity. Arabica trees grow best at higher altitudes and are more sensitive to growing conditions. Varieties such as Typica and Bourbon are part of the Arabica family. Notable FrontStreet offerings include the Brazil Yirgacheffe-tasting Gedeb and Panama’s floral Geisha.
• Robusta (Coffea canephora): Makes up around 20–30% of global production. Robusta trees are hardier, more disease-resistant, and grow at lower altitudes. The beans have a stronger, more bitter flavour with higher caffeine content. Their leaves are longer, soft oval or pointed, and a brighter green than Arabica’s.
• Liberica (Coffea liberica): Much less common and grown in specific regions like Southeast Asia. It has a unique, woody flavour profile and larger tree morphology.

How Coffee Cherries Develop and Ripen

A coffee tree typically begins flowering at around three years of age. The small, white, five-petal flowers emit a light jasmine fragrance and grow in dense clusters. After the flowers fall, coffee cherries begin to form. These are drupes—stone fruits—with a diameter of about 1.5 cm. They start off green, turn yellow, and eventually ripen to a bright red, resembling cherries.

Each coffee cherry usually contains two seeds—or beans—positioned flat-face to flat-face. Each bean is encased in a thin membrane called the silverskin, surrounded by a yellowish layer known as the parchment or endocarp. The beans sit inside a sweet, mucilaginous pulp that makes up the fruit’s flesh, with a tough outer skin.

How Coffee Beans Are Processed After Harvest

Processing is how the coffee bean is removed from the fruit. There are two main methods:

• Natural (Dry) Process: The coffee cherries are spread out in the sun to dry completely. Once the outer fruit is fully dried and brittle, the beans are removed. This method is simple but climate-dependent and can result in earthy flavours if not managed well. Unripe beans are also harder to sort out, and the coffee may taste more rustic or dirty.
• Washed (Wet) Process: The cherries are first soaked to soften them, then the outer skin and pulp are removed using a depulper. The beans are then fermented in water tanks for 12–24 hours to break down any remaining fruit residue. After fermentation, the beans are washed clean and dried. This method generally yields cleaner, brighter flavours and allows for better sorting of unripe beans. Fermentation typically takes half a day to a full day.

From Tree to Roast: How Coffee Gets Its Flavour

Originally, coffee beans were consumed whole, chewed for their energy-rich juice. Later, they were ground with animal fat for long journeys. By the 10th century, people boiled raw beans as a beverage. It wasn’t until the 13th century that Arabs discovered roasting. Roasting unlocks the complex aromas and flavours we now associate with coffee. Without it, coffee is just a bitter seed.

Understanding Coffee Roast Levels

Roast levels broadly fall into three categories:

• Light Roast: Bright acidity, more origin characteristics, lighter body.
• Medium Roast: Balanced acidity and body, often with caramelised sweetness.
• Dark Roast: Bold, bitter flavours, reduced acidity, heavier body.

The roast level you choose—light, medium, or dark—affects how the inherent flavours of the bean are expressed. Lighter roasts preserve more of the coffee’s unique origin traits, while darker roasts bring out more generic boldness and bitterness. The optimal roast depends on the bean variety, brewing method, and personal taste.

Frequently Asked Questions

What is the scientific name of the coffee plant?

The coffee plant belongs to the genus Coffea, part of the Rubiaceae family. The most commonly cultivated species are Coffea arabica (Arabica) and Coffea canephora (Robusta).

Where are coffee trees originally from?

Coffee trees are native to the highland regions of Ethiopia in Africa. This is where the first coffee plants were discovered and cultivated.

What is a coffee bean, really?

A coffee bean is the seed inside the fruit of the coffee tree, commonly called a coffee cherry. Though bean-shaped, it is botanically a seed, not a legume.

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

A coffee tree typically begins to bear fruit, or coffee cherries, around three to four years after planting. It reaches peak production in its early years but can continue producing for 20–25 years, with some trees fruiting for over a century.

What are the two main types of coffee plants?

The two primary coffee species are Arabica and Robusta. Arabica makes up about 70% of global production and is known for its acidity and complexity. Robusta accounts for 20–30% and is more bitter, with higher caffeine content and greater pest resistance.

What are the main coffee processing methods?

The two main processing methods are the natural (dry) process, where cherries are sun-dried whole, and the washed (wet) process, where the fruit is removed before drying. Each method affects the final flavour of the coffee.

Why do coffee trees only grow in certain regions?

Coffee trees require a specific climate found between the 25°N and 25°S latitudes—known as the coffee belt. They need consistent warmth, moderate rainfall, and distinct dry seasons to flower and produce fruit properly.

Recommended FrontStreet Beans for Exploring Coffee Origins

Explore the diversity of the coffee tree’s legacy with these handpicked FrontStreet beans. Start with Brazil Yirgacheffe-tasting Gesha from the high-altitude region—medium roasted for a creamy body, mild acidity, and notes of nuts and caramel. For something fruitier, try Colombia Sidra from the Huila region, featuring double anaerobic fermentation for intense stone fruit and berry aromas. Finally, try Kenya Little Tomato, a bright, medium-light roasted SL28/SL34 blend with vivid berry and floral tones. All are single-origin Arabicas ideal for pour-over. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.