Most of the trees and plants shed their leaves once a year usually during autumn, and new leaves sprout on them during spring. After the defoliation, these trees appear quite barren. The trees which shed leaves every year are called ‘deciduous trees‘. However, there are other trees, which do not shed all their leaves at once, and thus they appear green throughout the year. Such trees are called evergreen trees. Do you know why these trees do not shed their leaves at once? The leaves of the trees, which undergo defoliation every year, live only for one year. On the other hand, leaves of the evergreen trees last for two to three years. As soon as a leaf withers, it falls down and a new leaf takes its place. Thus all leaves do not fall at a time. As a result, the tree always retains a large number of leaves and this cycle continues. Among the well-known evergreen trees are pines and firs. Besides these, there are many other trees that always remain green. The Italian cypress found in Europe is one such tree. The olive plant also comes under the category of evergreen plants. Its oil is very useful to us. The magnolia plants are used for decoration because their white flowers are very beautiful and do not undergo defoliation. Perfumes are extracted from the evergreen plants of the rosemary. The juniper plants, having short and bitter leaves, which are found in North Britain are famous for their greenness. In addition to these, other evergreen plants and trees are myrtle of Britain, oleander of North Africa, oak tree, ivy creeper, orange tree and tall palm tree. The tea plant also comes under the category of the evergreen plants.