The plant is generally considered to be an upland species and the optimum temperature range is 15-24 °C, photosynthesis being reduce at temperatures above 25 °C. Coffee grows on soils with varying acidity. Slightly acid soils, as present under montane forest in southwestern Ethiopia, are the most suitable.
Since coffee is an evergreen plant, it requires sub-soil water at all time. Thus, deep soils with good water-holding capacity are the most suitable environment for coffee growth.
The soil structure must also allow good drainage because the surface feeding roots need a drier period for part of the year to slow down growth ripen the wood and initiate flower bus. Properly controlled irrigations can increase the yield and bean quality of coffee arabica.
Soil suitable for coffee arabica