Most eucalyptus oil on the market is produced from the leaves of "Eucalyptus globulus". "Eucalyptus globulus" is the principal source of eucalyptus oil worldwide. He planted many trees including pine, cedar, eucalyptus and beech. The oases grow date palms, acacia and eucalyptus trees. Plantations of imported tree species are predominant, particularly the non-native eucalyptus and pine. These forests are mostly of mulberry, acacia, and eucalyptus. Palms, eucalyptus and citrus fruits are among the trees which give Nice a subtropical appearance. These grasslands are mingled with plantations of eucalyptus and native oak. In Laguna Beach, settlers planted groves of eucalyptus trees. They occupy a range of different habitats, including rainforest, eucalyptus and acacia forest, and shrublands. Fig, eucalyptus, agave, and various palm trees grow in the warmer areas. Ringtail possums prefer forests of dense brush, particularly eucalyptus forests. Native species have received increasing attention as an alternative to eucalyptus and pine. Natural viricides are produced by some plants such as eucalyptus and Australian tea trees. A high oil content hop known for strong aroma including fruitiness, eucalyptus, clove, and tobacco.