The Eucalyptus tree is beautiful; it is a tall evergreen that can grow up to 90 meters high (270 feet). The young trees have oval bluish-green leaves while the mature trees develop long, narrow, yellowish leaves, creamy-white flowers and a smooth, pale grey bark. Eucalyptus oil has a cooling and deodorizing effect on the body, helping with fevers, migraine and malaria. For the respiratory tract, it helps with coughs, asthma, throat infections, sinusitis and catarrhal conditions. It soothes inflammation and eases mucus, clearing the head from the stuffiness of colds and hay fever.