What differentiates Arabica from Robusta coffee beans in terms of caffeine content?

Robusta coffee beans are known for having a higher caffeine content compared to Arabica beans. This difference is not just quantitative but also influences the beans' flavor profile and growing conditions. The higher caffeine level in Robusta contributes to a more bitter taste and can provide a stronger, more robust flavor, which is often preferred for espresso blends.

Furthermore, caffeine acts as a natural pest deterrent, allowing Robusta beans to thrive in environments that may not be suitable for Arabica beans, which require more care and specific growing conditions. The caffeine content thus plays a significant role in both the cultivation and the flavor characteristics of the two types of beans, establishing Robusta as the bean variety with the edge in caffeine content compared to Arabica.