The coffee “tree” is actually a variety of the tropical evergreen shrub. There are three species of the coffee “tree.” All three are of African origin- arabica, liberica and robusta. Arabica originated in Ethiopia and is best suited to higher altitudes from 2000 to 6500 feet. Liberica originated in West Africa and robusta originated in the Congo, both do better below 2000 feet. Liberica and robusta trees are hardy, do well in forest environments and require less maintenance than arabicas. Liberica and robusta trees also produce higher yields, but the coffee they produce tends to have a harsh flavor in comparison to arabicas, as well as, their caffeine content can be as much as 50% higher. The coffee tree does not begin to produce its full yield until its sixth year, and will continue produce for about ten years.