Ornamental trees are the most long-lived elements and structures in any arrangement, which produce a strong visual impact only by virtue of their size. There is a very wide range from which we can choose the species of ornamental trees, which differ according to size, climatic conditions, growth, as well as according to the size and style of the garden. Both deciduous and evergreen trees offer structure and beauty throughout the year, but they have many more benefits such as: they create shade in the summer, shelter in the winter, nesting places or food for birds, insects and other animals. Trees also help reduce pollution and combat climate change by absorbing carbon dioxide from the atmosphere, replacing it with "green" oxygen. They can even help regulate the water table, an important benefit in places at risk of flooding and soil erosion.