What You Need to Know About Coffee Trees and Species

If you've ever sipped a cup of coffee and wondered where it all began, it starts with the coffee tree—more specifically, with how that tree grows, what it produces, and why some beans taste wildly different from others. Understanding the plant behind your daily brew gives you insight into flavor, processing, and quality.

Coffee trees are evergreen plants from the Rubiaceae family. Wild ones can reach 5 to 10 meters tall, but those grown on farms are pruned to under 2 meters to boost yield and ease harvesting. They produce coffee cherries—red, cherry-like fruits containing the seeds we know as coffee beans.

What Kind of Plant Is a Coffee Tree?

Coffee trees (Coffea) are classified as evergreen shrubs or small trees in the Rubiaceae (or madder) family. In their natural state, they can grow quite tall—between 5 and 10 meters—but in commercial coffee plantations, they’re kept below 2 meters. This pruning encourages more fruit production and makes the coffee cherries easier to pick.

The trees have oval-shaped, smooth leaves that grow in opposite pairs. Their branches grow long at the tips but don’t branch out much. White flowers bloom where the leaf stems meet the branches, and these eventually develop into coffee cherries.

What Do Coffee Cherries and Beans Look Like?

Mature coffee cherries look like bright red cherries and have sweet flesh. Inside each cherry are typically two seeds—that’s what we call coffee beans. These beans are the part of the plant that’s harvested, processed, roasted, and brewed.

The shape and form of the beans vary depending on the coffee species, and those physical traits influence how the coffee tastes and how it's processed.

Arabica vs Robusta: The Two Main Coffee Species

There are two primary commercially grown coffee species: Coffea arabica (arabica) and Coffea canephora (commonly called robusta). There are also minor species like Coffea liberica (liberica) and Coffea arabusta (a hybrid), though these are rarely seen in the market.

Robusta coffee plants are hardier. They can grow at lower altitudes, resist diseases better, and produce higher yields. Robusta beans are more rounded, with a straight crease and a slightly bulging center that some compare to soybeans. Their flavor profile is considered less complex, and they contain about 2 to 3 times more caffeine than arabica. Because of this, robusta is often used in instant coffee and low-cost commercial blends.

Arabica beans, on the other hand, are more oval-shaped with a curved crease, resembling half a peanut. They are grown at higher elevations—typically between 1,000 and 2,000 meters above sea level—and require specific climate conditions to thrive.

Where Arabica Coffee Grows Best

Arabica coffee plants flourish in environments that aren’t too wet or hot. Ideal daytime temperatures are mild, ideally staying under 2 hours of direct sunlight per day. In regions without consistent afternoon rain or fog, farmers often plant taller shade trees to protect the coffee from too much sun.

At night, arabica plants prefer cool temperatures around 10°C (50°F). Too warm, and the cherries mature too quickly, reducing bean density and flavor complexity. Too cold, especially if frost forms, and the trees can die.

Because of these requirements, the best regions for growing arabica are found along the “Coffee Belt”—the area between the Tropic of Cancer and the Tropic of Capricorn, where mountainous terrain provides the necessary altitude and climate. This zone offers well-drained, fertile soils and the right balance of sun, rain, and temperature fluctuation.

Frequently Asked Questions

How tall can wild coffee trees grow?

Wild coffee trees can grow up to 5 to 10 meters tall. However, cultivated coffee trees are usually pruned to stay under 2 meters to make harvesting easier and increase fruit yield.

What do coffee cherries look like?

Coffee cherries are bright red and cherry-like when ripe. Each cherry typically contains two coffee beans surrounded by sweet fruit pulp.

What’s the difference between arabica and robusta coffee beans?

Arabica beans are oval with a curved crease and are grown at higher altitudes. They have a more complex flavor but are more delicate. Robusta beans are rounder, contain more caffeine (2–3x more), and are hardier, but have a simpler, more bitter taste. Robusta is often used in instant coffee and cheaper blends.

Why are coffee trees pruned to stay short?

Coffee trees are pruned to under 2 meters on farms to increase the number of coffee cherries produced per tree and to make harvesting easier and safer.

What climate do arabica coffee plants need?

Arabica thrives at 1,000–2,000 meters altitude with mild temperatures, limited direct sunlight (less than 2 hours per day), steady rainfall, and cool nights around 10°C. They are sensitive to frost and excessive heat.

Where is the coffee belt?

The “Coffee Belt” is the region between the Tropic of Cancer and the Tropic of Capricorn. It includes mountainous areas that provide the ideal elevation, climate, and soil for growing high-quality arabica coffee.

Recommended FrontStreet Coffee Beans from the Coffee Belt

For coffee lovers curious about where their beans come from, try FrontStreet Coffee’s Ethiopia Yirgacheffe – a bright, floral washed Ethiopian lot with citrus and stone fruit notes. For something deeper, their Honduras Finca Los Lajones offers balanced chocolate and nuttiness from a robusta-friendly altitude, while Panama Geisha highlights the elegance arabica can achieve at high elevations. All are grown in classic coffee belt regions. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.