sentences:  Fruits, avocadoes and spices are important cash crops.Coffee is also an important cash crop in Gomma; over 50 square kilometers are planted with this crop.Coffee is grown in this woreda under shade trees; while the dominant species are "Albizia gummifera", which can shade as many as 150 coffee trees, and "Millettia ferruginea", other species are also used as shade trees.