Arabica and Robusta are the two major commercially grown coffee species. Arabica tends to be sweeter and more complex with less caffeine; Robusta is stronger, more bitter, higher in caffeine, and hardier to grow.
The Simple Guide
Arabica — grown at higher altitudes, more delicate to farm, generally sweeter and more nuanced with brighter acidity. Makes up the majority of specialty coffee.
Robusta — grown at lower altitudes, hardier and higher-yielding, roughly double the caffeine, and a bolder, more bitter, sometimes woody or rubbery flavor. Common in instant coffee and some espresso blends for crema and body.
Why It Matters
Species alone doesn't determine whether a coffee is "good." A carefully grown and processed Robusta can outperform a poorly handled Arabica. But if you're choosing between two bags and want the more classically "specialty" flavor profile, Arabica is the safer bet.
What To Do
Check the bag or product description — specialty roasters like ours are almost always 100% Arabica. If you want a bolder, higher-caffeine cup or you're building an espresso blend, a small percentage of quality Robusta can add body and crema.
High-altitude, well-processed Arabica is the industry standard for specialty coffee. But fine Robustas are gaining real respect — some espresso blends use a small percentage to add crema and body without dulling the Arabica's character.