On every bag of specialty coffee it is somewhere. 100% arabica. Sometimes big, sometimes small print, but it is always there. As if it is a guarantee. But what does it actually mean, and why is arabica vs robusta even a discussion?
You only understand that when you know what robusta is and what it does in coffee.
The difference arabica robusta in taste
Arabica coffee grows at high altitude, between 600 and 2000 metres. Due to the lower temperatures the cherry ripens more slowly, which creates more sugars and flavour compounds. The result is a bean with fruity notes, bright acidity and a soft, complex flavour. Arabica also contains more lipids and almost twice as much sugar as robusta — you taste that immediately.
Robusta grows at lower altitudes, is hardier and produces more per plant. The flavour is heavier, earthier and bitter. Not necessarily bad, but fundamentally different. In Italian espresso blends robusta is sometimes deliberately added for more crema and body. It works there. In a filter or pour-over however the bitterness lands like a stone.
Caffeine, cultivation and the best coffee bean for specialty
Robusta contains almost twice as much caffeine as arabica — around 2.7% versus 1.5% in arabica. That high caffeine works as a natural defence against insects, making the plant easier to grow. Cheaper, higher yield, fewer problems. That is also why robusta ends up in instant coffee and many supermarket blends. Not for the taste, but for the margin.
Arabica demands more. The plant is more sensitive, grows more slowly, must be harvested by hand because the cherries do not all ripen at the same time. That raises the cost. But it also raises the quality. Specialty coffee is almost always arabica, simply because the raw material is more interesting to work with. As the SCA system for specialty coffee shows, quality assessment is entirely about flavour complexity — and arabica wins that structurally.
When robusta does work
Being honest means saying this too: good robusta exists. Specialty robusta, grown on small plots in Vietnam or Uganda, can be surprisingly complex. But that is the exception. The vast majority of robusta on the market is cheap, functional and aimed at volume. It is the bean behind the instant coffee you get from the parcel courier.
If you want to score above 80 points on the SCA scale — the threshold for real specialty — then arabica koffie is almost always the starting point. The growing conditions in regions like Chiapas in Mexico, at 1200 to 1800 metres altitude, produce exactly the type of arabica that achieves that complexity in the cup. More about why coffee from Chiapas tastes so special is here. And those who want to understand the science behind the difference will find a clear explanation at Homegrounds.