How Coffee Trees Grow: Climate, Varieties & Harvesting Facts

Ever wondered why your favorite single-origin espresso tastes so different from your morning supermarket blend? Much of that flavor starts long before roasting — in the soil, sun, and altitude where coffee trees grow. Understanding how coffee trees develop, where they thrive, and how the beans are picked helps explain the diversity in your cup.

To grow high-quality coffee, trees need very specific conditions: temperatures between 15–25°C, 1500–2000mm annual rainfall timed with flowering, rich well-drained soil, and altitudes of 500–2000 meters. Not all regions within the “coffee belt” — the tropics between 23.5°N and 23.5°S — can meet these strict standards.

What Is a Coffee Bean, Really?

The coffee bean isn’t a bean at all — it’s the seed inside the fruit of the coffee tree. That familiar bean shape comes from the seed’s flat sides, and it’s surrounded by layers including the silver skin, parchment (endocarp), pectin layer, pulp (mesocarp), and outer skin (exocarp). What we roast and grind is just the seed, hidden inside the cherry-like fruit.

The Three Main Coffee Tree Species

1. Arabica (Coffea arabica)

Making up around 70% of global production, Arabica is the most widely grown and prized coffee species. Originating in Ethiopia, it thrives at higher altitudes of 500–2000 meters, especially where days and nights have a large temperature difference. Arabica prefers fertile, well-drained soil, moderate sunlight, and some shade. It’s more delicate, vulnerable to pests and disease, and produces less per tree — but it delivers the complex, nuanced flavors sought after in specialty coffee. Most famous coffees like Blue Mountain and Mocha are Arabica.

2. Robusta (Coffea canephora)

Robusta accounts for roughly 20–30% of the world’s coffee. Native to the Congo, it grows well at low altitudes below 500 meters and is far hardier than Arabica. It resists disease, survives poor soils, and needs minimal care — making it cheaper to farm. However, it produces a harsher, more bitter cup and is mostly used in instant coffee and lower-cost blends. Robusta has twice the caffeine of Arabica, which contributes to its strong, bitter taste and natural pest resistance. Most coffee served at fast-food chains uses Robusta beans.

3. Liberica (Coffea liberica)

Making up less than 5% of global coffee production, Liberica is rare and mainly grown in Liberia, Suriname, and Guyana. It originated in West Africa and does well at low altitudes. The beans are known for intense, unique flavors with strong bitterness and a distinctive aroma. Though less common today, Liberica played a role in filling supply gaps during historical coffee shortages.

From Flower to Cherry: The Coffee Growth Cycle

Coffee trees start producing flowers about three years after planting. These small, white, jasmine-scented, tubular blossoms grow in dense clusters. Within two to three days, the petals fall, and fruit begins to form. The coffee fruit, called a coffee cherry, is a drupe about 1.5 cm in diameter. It starts green, turns yellow, then red when ripe — just like a cherry, hence the name. Each cherry typically holds two seeds (coffee beans) that sit facing each other, encased in a sweet, sticky pulp, covered by a thin membrane (silver skin), and a parchment layer.

When and How Coffee Is Harvested

Coffee cherries are ready to pick when the outer skin turns bright red. Most Arabica varieties ripen between June and August, while Robusta matures around September to October. However, depending on the region and climate, there may be one or two annual harvests. In countries without distinct wet/dry seasons (like Colombia and Kenya), two flowerings can lead to two harvests, though technically each tree has one main annual cycle.

Harvest periods vary by geography. Farms near the equator (e.g., Ethiopia, Central America) usually harvest once between September and November. South of the equator (like Brazil and Zimbabwe), the main harvest is around April or May, though some picking may continue into August. Near the equator (e.g., Uganda, Colombia), where altitude diversity allows, harvesting can happen year-round.

There are two main harvesting methods. Strip picking involves harvesting all cherries from a branch at once, regardless of ripeness. Selective picking means returning to the trees every 8–10 days to hand-pick only red, ripe cherries — essential for high-quality Arabica, especially for washed processing. This labor-intensive method is more expensive but yields better flavor.

On average, a picker can harvest 50–100 kg of cherries per day, but only 20% of that weight is usable coffee beans — about 10–20 kg. Those beans are packed into 45–60 kg sacks, so it takes a worker about 3–6 days to fill one. Harvesting often accounts for half a farm’s yearly costs.

In places like Brazil, mechanical harvesters are used to shake ripe cherries off the branches. These machines only work on flat land with evenly spaced trees and require extensive setup and post-harvest sorting to remove leaves and twigs. Even with machines, much coffee worldwide is still hand-picked to maintain quality. Unripe, damaged, or overripe beans — labeled “ordinary,” “sour,” or “fermented” — can ruin the flavor of the lot and are sorted out.

Frequently Asked Questions

What is the ideal climate for growing coffee trees?

Coffee trees grow best in tropical or subtropical climates with temperatures between 15–25°C, annual rainfall of 1500–2000 mm timed to the flowering cycle, and well-drained, fertile soil. They also require some shade to protect against harsh sun, especially at higher altitudes where temperatures are cooler.

What are the three main types of coffee trees?

The three primary commercial coffee species are Arabica, Robusta, and Liberica. Arabica makes up around 70% of global production and is known for high quality and complex flavors. Robusta accounts for 20–30% and is hardier but more bitter. Liberica is rare, making up under 5%, with a unique strong flavor profile.

Why are most high-quality coffees grown at higher altitudes?

Higher altitudes (500–2000 meters) tend to have cooler temperatures and greater day-night temperature variation, which slows coffee cherry ripening. This slower development allows more complex sugars and flavors to develop in the beans, especially in Arabica varieties.

How are coffee cherries harvested?

Coffee cherries are harvested either by strip picking (removing all cherries at once) or selective picking (harvesting only ripe red cherries every 8–10 days). Selective picking is labor-intensive but necessary for high-quality Arabica, especially for washed processing. On average, a worker picks 50–100 kg of cherries daily, yielding just 10–20 kg of beans.

What’s the difference between Arabica and Robusta coffee trees?

Arabica trees produce sweeter, more complex, and higher-quality beans but are fragile and grow best at higher altitudes. Robusta trees are hardy, grow at low altitudes, produce more beans per tree, and have a stronger, more bitter flavor. Robusta also has twice the caffeine content of Arabica.

Recommended FrontStreet Beans for Coffee Tree Lovers

Explore the origins of your coffee with FrontStreet’s Ethiopia Yirgacheffe, a high-grown Arabica with bright acidity and floral notes, and Guatemala Antigua, a medium-bodied washed coffee with chocolate and citrus tones grown at 1600 meters. For something bolder, try Sumatra Mandheling, a full-bodied, earthy classic. All showcase the diversity shaped by terroir and processing. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.