What Is Coffee? The Origins of Coffee Plants

You’ve sipped countless cups, but have you ever wondered: what exactly is coffee? Not the drink—but the plant it comes from? The answer isn’t simple. Behind every shot of espresso and pour-over is a tropical shrub with a botanical family tree far more tangled than most coffee drinkers imagine.

Coffee comes from plants in the genus Coffea, part of the Rubiaceae (madder) family. Of the many wild species, only two are commercially important: Coffea arabica (Arabica) and Coffea canephora (Robusta’s parent species). Within these, hundreds of varieties exist—but not all make great coffee.

The Two Main Commercial Coffee Species

Arabica and Canephora dominate the global coffee trade. Robusta, the high-yield, bitter-tasting variety most people know, is actually a robust strain of Canephora. Arabica tends to produce more nuanced flavours, while Canephora (including Robusta) offers stronger body and higher caffeine but often lacks complexity. Other species include Liberica (discovered in Liberia in 1843) and Excelsa (also called Coffea liberica var. dewevrei), both similar in flavour profile to Robusta and generally considered inferior for specialty coffee.

Varieties, Hybrids, and Flavour Trade-offs

Within Arabica and Canephora, there are countless cultivated varieties—some naturally occurring, others selectively bred. While hybridisation can improve yield, disease resistance, and even the lifespan of coffee trees, flavour is usually compromised. Breeders continue searching for the balance between hardiness and cup quality, but no hybrid has yet surpassed the best traditional varieties in taste.

Where Coffee Grows: Climate and Plant Appearance

All coffee species grow in the tropics, specifically between the Tropics of Cancer and Capricorn. However, depending on the variety, coffee plants can look strikingly different. Leaves range from light to dark green or even bronze, and some sport wavy, shiny foliage—a look you won’t find on standard Robusta or Arabica. While some coffee plants remain bush-sized, unpruned specimens can grow up to 18 metres tall, resembling small trees.

Frequently Asked Questions

What is coffee made from?

Coffee is made from the seeds (commonly called beans) of plants in the Coffea genus, primarily Coffea arabica and Coffea canephora. These seeds are harvested from tropical shrubs or small trees, processed, roasted, and then brewed.

What’s the difference between Arabica and Robusta?

Arabica (Coffea arabica) is known for its complex flavours and lower caffeine content, while Robusta (a high-yield variety of Coffea canephora) is stronger, more bitter, and has nearly twice the caffeine. Robusta is also more disease-resistant and grows at lower altitudes.

Are there other coffee species besides Arabica and Robusta?

Yes. Other species include Liberica (discovered in Liberia in 1843) and Excelsa (also called Coffea liberica var. dewevrei). Both are similar in taste to Robusta and are generally considered to have inferior cup quality for specialty coffee.

Do coffee plants all look the same?

No. Depending on the species and variety, coffee plants can vary in leaf colour (from light to dark green or bronze), leaf shape, and height. Some remain small like bushes, while untrimmed plants can reach up to 18 metres tall.

Why are hybrids less flavourful?

Though hybrid coffee plants may offer advantages like higher yield, disease resistance, and longer lifespan, flavour quality typically declines. Breeders aim to balance these traits, but no hybrid has matched the best traditional varieties in taste.

Recommended FrontStreet Coffee for Coffee Botany Fans

Explore the origins of coffee with FrontStreet Coffee’s Ethiopia Yirgacheffe, a bright and floral single origin that highlights the delicate side of Arabica. For contrast, try their Brazil Queen Manor, a smooth, nutty washed coffee from a classic Robusta-influenced region that shows the balance Canephora can bring. Both beans showcase the diversity within the Coffea genus. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.