Two major coffee trees, Arabica and Robusta.

At present, the most important coffee trees in the world are Arabica and Robusta. These two kinds of coffee trees are the two original species of coffee trees, and the quality of coffee beans produced by these two kinds of coffee trees is also better than that of other coffee trees. Arabica coffee tree. The Arabica coffee tree, which originated from Ethiopia in East Africa, accounts for 70% of the world's output of coffee beans; the world-famous Blue Mountain Coffee and Mocha Coffee are almost all Arabica species. Arabica coffee trees are suitable for growing in high mountains with large temperature differences between day and night, as well as soils with low humidity and good drainage; the ideal altitude is 500-2000 meters, and the higher the altitude, the better the quality. However, due to the weak ability of resistance to diseases and insect pests, it is more difficult to grow than other coffee trees. Arabica beans have oval fruits and flat seeds, and some with only one seed are called "round beans". Arabica beans taste mellow, prominent aroma, S-shaped from the cracks in the middle of the fruit. Robusta Coffee Tree. The Congo, which originated in Africa (and some say Uganda), accounts for about 20% to 30% of the world's output. The Robusta coffee tree is suitable for planting in the lowlands below 500 meters above sea level, has strong adaptability to the environment, can resist bad climate, resist diseases and insect pests, and does not need much manual care during soil preparation, weeding and pruning, and can be allowed to grow in the wild. It is a kind of coffee tree that is easy to cultivate. But its flavor is bitterer and its quality is much lower than that of Arabica, but it has the texture and consistency that Arabica does not have. It generally contains twice as much caffeine as Arabica beans, and its fruit is rounder and smaller than Arabica. The cracks in the middle of the fruit show a straight line.