One way in which the eucalyptus , mainly the blue gum , proved valuable in California was in providing windbreaks for highways , orange groves , and other farms in the mostly treeless central part of the state .
One way in which the eucalyptus , mainly the blue gum E. globulus , proved valuable in California was in providing windbreaks for highways , orange groves , and other farms in the mostly treeless central part of the state .