What Is a Coffee Tree and How Does It Grow?

Ever wondered where your morning coffee actually comes from? Not the bag, not the roast — but the actual plant that grows the beans. Most people have never seen a coffee tree, let alone thought about how those bright red ‘cherries’ end up as your espresso shot. Understanding the coffee tree is the first step to understanding your coffee’s flavor, origin, and quality.

Coffee comes from the seeds of a tropical evergreen tree in the Rubiaceae family, genus Coffea. The fruit — called a coffee cherry — holds two seeds we call beans. These trees only thrive between the Tropics of Cancer and Capricorn: roughly 25° north and south of the equator, in a region known as the Coffee Belt.

What Is a Coffee Tree?

The coffee tree is a tropical evergreen belonging to the Rubiaceae family, subgenus Coffee. Though commonly called a bean, the part we roast and brew is actually the seed inside the coffee fruit, or cherry. Shaped like a bean, hence the name, it’s encased in layers including the silverskin, parchment, pectin-rich pulp, and outer skin. Wild coffee trees can reach up to 10 meters tall, but cultivated trees are pruned to 2–4 meters for easier harvesting.

The coffee tree’s leaves grow opposite each other on horizontal or drooping branches. They are dark green and arranged in pairs along short lateral stems. Though often thought of as a single kind of plant, there are several key species that determine flavor, hardiness, and yield.

Where Do Coffee Trees Grow?

Coffee trees require very specific growing conditions found only in tropical and subtropical climates. The ideal zone for coffee cultivation is between 25 degrees north and 25 degrees south of the equator — the Coffee Belt. This region offers the consistent warmth, rainfall, and elevation needed for coffee cherries to develop properly. Outside this band, temperatures are typically too cold or too variable for the trees to thrive.

Climate is the single most important factor in coffee cultivation. Without the right combination of temperature, altitude, and rainfall, coffee trees will not produce quality fruit. That’s why the majority of the world’s coffee comes from countries located within this narrow equatorial band.

The Two Main Coffee Species: Arabica vs. Robusta

There are over a dozen species of coffee, but only three are commercially significant: Arabica, Robusta, and Liberica. Among these, Arabica and Robusta dominate global production.

Arabica (Coffea arabica) makes up around 70% of the world’s coffee. Its leaves are about 15 cm long, and it’s known for higher acidity, more complex flavors, and lower caffeine content. It’s the source of iconic coffees like Blue Mountain and Yirgacheffe. Arabica trees are more delicate, requiring higher altitudes and careful growing conditions.

Robusta (Coffea canephora), on the other hand, accounts for about 20–30% of global production. It originated in the Congo and is hardier, growing at lower altitudes. Its leaves are longer, soft, oval or pointed, and a brighter green than Arabica’s. Robusta beans contain roughly twice the caffeine of Arabica, leading to a harsher, more bitter cup with earthy, nutty flavors. It’s often used in espresso blends for added crema and body.

Liberica (Coffea liberica) is much rarer and represents less than 1% of global production. It has a unique, woody flavor and large, irregular beans.

From Flower to Coffee Cherry

A coffee tree typically begins flowering when it’s around three years old. The flowers are small, white, and shaped like five-pointed tubes, giving off a light jasmine-like fragrance. They grow in dense clusters and bloom for just two or three days before falling off. After pollination, it takes several months for the coffee cherry to form.

The coffee cherry is a drupe — similar to a plum — about 1.5 cm in diameter. It starts green, turns yellow, then red as it ripens, resembling a cherry. This is when it’s ready to be picked. Each cherry usually contains two seeds (coffee beans) that sit facing each other, flat sides touching. The beans are surrounded by a thin membrane called the silverskin, then a yellowish layer called the parchment, all encased in sweet, sticky pulp and a tough outer skin.

The entire process — from flower to ripe cherry — takes roughly nine months, though this varies based on climate, variety, and elevation.

How Coffee Beans Are Processed

Once harvested, the coffee cherry must be processed to extract the bean inside. There are two main methods: washed (wet) and natural (dry).

In the washed or water-processed method, cherries are first soaked in water tanks for 24–28 hours. This allows unripe or defective cherries to float and be removed, while ripe ones sink. The beans are then stripped of their outer skin and pulp using a depulper. The remaining mucilage is broken down through fermentation — typically half a day to a full day — before being washed away. Finally, the beans are dried in the sun until their moisture content drops to around 11–12%, and the parchment is later removed by a hulling machine.

The natural or dry method is simpler: cherries are spread out in the sun and left to dry completely, sometimes for several weeks. Once dry, the outer fruit, pulp, and parchment are removed mechanically. While cheaper and less dependent on water, this method is more susceptible to spoilage, inconsistent drying, and off-flavors. It often results in earthier, heavier-bodied cups, and requires careful management to avoid mold or over-fermentation.

The washed method generally produces cleaner, brighter flavors and allows for better sorting of unripe beans, while the natural method tends to highlight sweetness and body at the risk of inconsistency.

How Coffee Flavor Develops During Roasting

Early coffee drinkers didn’t roast beans at all — they chewed the whole fruit for its juice, or ground the beans with animal fat for energy on long journeys. By the year 1000, people were boiling raw beans. Not until the 13th century did the practice of roasting coffee beans emerge in the Arab world, unlocking the rich aromas and flavors we associate with coffee today.

Roasting transforms green coffee beans through a series of chemical reactions, most notably the Maillard reaction, which develops the complex flavors and aromas. The degree of roast — light, medium, or dark — dramatically impacts the final taste.

Light roasts preserve more of the bean’s inherent acidity and origin characteristics, often highlighting floral, fruity, or tea-like notes. Medium roasts balance acidity and body, bringing out caramel and nut flavors. Dark roasts emphasize bold, bitter, and smoky profiles, with less origin distinction.

The “right” roast depends on the coffee variety, brewing method, and personal preference. There’s no universal best roast — just the one that best highlights the qualities of the bean you’re brewing.

Frequently Asked Questions

Where do coffee beans come from originally?

Coffee beans come from the Coffea plant, native to tropical Africa, specifically the highlands of Ethiopia. The earliest evidence of coffee consumption comes from the Kafa region in Ethiopia, where wild coffee trees still grow. From there, coffee cultivation spread to the Arabian Peninsula and eventually worldwide.

What is the coffee fruit called?

The fruit of the coffee tree is called a coffee cherry. It is a small, round stone fruit that turns from green to red (or sometimes yellow or orange) as it ripens. Each cherry typically contains two coffee beans surrounded by sweet pulp, parchment, and a protective outer skin.

Why do coffee trees only grow in certain regions?

Coffee trees require a very specific combination of warm temperatures (18–24°C), consistent rainfall, and elevations typically between 800–2,000 meters above sea level. These conditions are naturally found within 25 degrees north and south of the equator — the Coffee Belt — which provides the ideal tropical and subtropical environment for coffee cherries to develop.

What’s the difference between Arabica and Robusta coffee?

Arabica coffee (Coffea arabica) makes up about 70% of global production and is known for its higher acidity, complex flavors, and smoother cup. It grows best at higher altitudes. Robusta (Coffea canephora) is heartier, has twice the caffeine, grows at lower altitudes, and produces a stronger, more bitter, and earthy cup. Arabica is generally considered superior in specialty coffee, while Robusta is often used for espresso blends or instant coffee.

How are coffee beans extracted from the cherry?

Coffee beans are extracted through either a washed (wet) process or a natural (dry) process. In the washed method, the cherry’s pulp is removed before drying. In the natural method, the whole cherry is dried before the beans are hulled. Each method affects flavor differently, with washed producing cleaner, brighter profiles and natural yielding sweeter, fruitier, and sometimes earthier cups.

How does roasting affect coffee flavor?

Roasting triggers chemical reactions like the Maillard reaction, which develops the flavors and aromas in coffee. Light roasts preserve origin characteristics and acidity; medium roasts offer balanced flavor and body; dark roasts bring out bold, bitter, and smoky notes. The roast level should match the bean type and brewing style for the best results.

Recommended FrontStreet Beans for Learning About Coffee Origins

Start exploring coffee varieties with FrontStreet’s single origins: try the washed Yirgacheffe from the Gedeb cooperative for bright citrus and floral notes; the Jamaica Blue Mountain No.1 Typica for balanced chocolate and nuts; or the Brazilian Yellow Bourbon for creamy peanut and caramel tones. Each shows how origin, variety, and processing shape flavor. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.