Robusta coffee, scientifically known as Coffea canephora, has been the world's second most popular coffee and makes up 40% of the world's coffee production. Robusta coffee plant is a smooth plant with broad, oval, wavy leaves and grows well in warmer climates. SHIPS IN 7-10 DAYS. Robusta beans grow faster and are more pest resistant. Robusta plants are easier to grow because they consume less favourable soil and climate conditions. They are mainly produced at lower altitudes of 600 to 2400 feet with a warmer climate. A cup of brewed Robusta has double the amount of antioxidants and caffeine, making it a strong coffee for anyone who consumes it. A Robusta coffee bean has about 2.7% caffeine in volume. It has a lower sugar content of about 3 - 7% as compared to other coffee types (like Arabica coffee).