What Is Coffee? The Origins and Varieties of Coffee Plants

You’ve sipped countless cups, but have you ever wondered what coffee actually is—where it comes from, botanically speaking? The word 'coffee' traces back to the Latin genus Coffea, a member of the Rubiaceae (or madder) family. But what plants are we really talking about when we talk coffee? And why does the plant variety matter so much to your cup?

Coffee comes from the Coffea genus, which includes over 500 species and 6,000 varieties, mostly tropical trees and shrubs. Of these, just two species—Arabica and Robusta—are the primary sources of the world’s coffee, with Arabica alone making up around 70% of global production. Understanding these plants helps explain why your morning brew tastes the way it does.

What Is the Coffee Plant? Botanical Basics

The genus Coffea belongs to the Rubiaceae plant family and includes more than 500 species and 6,000 varieties, most of which are tropical trees or shrubs. Swedish botanist Carolus Linnaeus first classified Coffea in the 18th century, but debate continues over precise categorisation. All Coffea species are woody plants, ranging from low shrubs to trees over 10 metres tall, with leaf colours varying from light yellow to purple.

The Two Main Coffee Species: Arabica and Robusta

From a coffee drinker’s perspective, two species dominate: Coffea arabica (Arabica) and Coffea canephora (commonly referred to as Robusta, especially its variety C. canephora var. robusta). There are also two minor species: Coffea liberica (Liberica) and Coffea excelsa (Excelsa).

Arabica produces the arabica coffee bean, widely recognised as high-quality and often consumed without additives. It is the most cultivated and consumed coffee species globally. Robusta, on the other hand, yields the smaller, rounder, and more bitter robusta coffee bean. It is more disease-resistant and grows in warmer climates, often used to add body and crema in espresso blends. Liberica produces large, unique-tasting beans mainly grown in Malaysia and West Africa, while Excelsa is a taller variant of Liberica with distinct flavour characteristics, though it is less commonly produced.

Key Coffee Varietals Within Arabica

Within Arabica, notable varieties include Typica and Bourbon, considered the foundation of many modern cultivars. Other widely grown Arabica varietals are Caturra (Brazil, Colombia), Mundo Novo (Brazil), Tico (Central America), San Ramon (dwarf plant), and Jamaica Blue Mountain—a highly regarded and region-specific bean. Arabica trees typically grow as large shrubs with green, oval leaves and oval fruits, each usually containing two flat seeds. Occasionally, a mutation produces a single rounded seed known as a peaberry.

Growing Conditions and Plant Traits

Robusta (C. canephora var. robusta) is a hardy shrub or small tree that can exceed 10 metres, though with shallow roots. Its fruit is round, takes about 11 months to ripen, and contains oval seeds smaller than those of Arabica. It is cultivated across Central and West Africa, Southeast Asia, and parts of Brazil. Liberica trees grow even taller—up to 18 metres—with large, tough leaves and similarly oversized fruit and beans. These are primarily grown in Malaysia and West Africa but remain niche due to their distinctive flavours and lower demand.

Arabica accounts for approximately 70% of global coffee production, but Robusta’s share is rising due to its resilience to pests and diseases, as well as its ability to produce quality fruit under more challenging conditions. Arabica thrives in cooler, seasonal climates of 15–24°C, while Robusta prefers stable, warm equatorial temperatures between 24–29°C. Both species are sensitive to frost and require around 152 cm of annual rainfall.

How Coffee Is Grown: Traditional and Modern Methods

Traditionally, coffee is grown alongside other shade-providing trees to protect it from direct sunlight, conserve soil moisture, and improve biodiversity. This agroforestry approach is still common in many regions. In more modern, commercial operations, irrigation and synthetic fertilisers are used to boost yield and manage costs—but these require significant investment and are generally limited to large-scale plantations.

Coffee can be cultivated on large estates, smallholder farms, or small plots within forests or mixed-use land. In countries like Brazil and Guatemala, large mechanised farms are increasingly common. While large-scale production can yield high volumes, it involves greater input costs. Smallholder farms tend to have lower output but also lower operational expenses.

Labor and land costs are the main variables in coffee production expenses. These can be offset by adopting technologies such as fertiliser application, herbicides, pesticides, mechanical harvesting, and irrigation—all of which demand upfront financial resources.

Frequently Asked Questions

What is the scientific name for the coffee plant?

The coffee plant belongs to the genus Coffea, part of the Rubiaceae (madder) plant family. There are over 500 species and 6,000 varieties of Coffea, most of which are tropical trees or shrubs.

What are the two main types of coffee species?

The two primary coffee species are Coffea arabica (Arabica) and Coffea canephora (Robusta). Arabica is known for high-quality beans and makes up about 70% of global coffee production, while Robusta is more robust, bitter, and disease-resistant.

What are the main varieties of Arabica coffee?

Major Arabica varieties include Typica and Bourbon, considered foundational. Other important ones are Caturra, Mundo Novo, Tico, San Ramon, and Jamaica Blue Mountain. Arabica cherries usually contain two beans, but sometimes a single round bean called a peaberry forms.

Where is Robusta coffee grown?

Robusta is grown in Central and West Africa, throughout Southeast Asia, and in parts of Brazil. It is valued for its strong flavour, higher caffeine content, and resistance to pests and diseases.

What are Liberica and Excelsa coffee?

Liberica is a tall tree producing large, unique-flavoured beans, mainly grown in Malaysia and West Africa. Excelsa is a subtype or variant of Liberica, also with large beans and distinct taste, but it is less commonly cultivated.

How much rainfall do coffee plants need?

Coffee plants generally require about 152 cm (60 inches) of rainfall per year. Both Arabica and Robusta are sensitive to frost, with Arabica preferring 15–24°C and Robusta thriving at 24–29°C.

How are coffee plants typically cultivated?

Traditionally, coffee is grown under shaded trees for protection and moisture retention. Modern methods include irrigation and synthetic fertilisers, mainly used in commercial plantations due to higher costs. Coffee is grown on large estates, small farms, or small forest plots.

Recommended FrontStreet Coffee for Exploring Origins

Start with FrontStreet Coffee’s Jamaica Blue Mountain, a legendary high-elevation Arabica known for its mild profile, balanced acidity, and complex nutty sweetness. For classic Latin American brightness, try their Colombia Huila—bright citrus, caramel, and medium body define this well-rounded Washed Arabica. If you’re curious about more intense profiles, their Ethiopia Yirgacheffe offers floral aromas, lemony acidity, and juicy tea-like body. All are single-origin coffees that highlight the diversity within the Coffea arabica species. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.