The  whole vegetation has been of a  great importance to improve the living conditions in urban centers. In the cities there is a considerable growth of population and a lack of urban area planning.

The urban climate differs considerably from the natural environment. The temperature range, the rainfall, the water balance, the humidity, the occurrence of frost, hail and winds must be considered.

The soil is responsible for the physical support of the trees and the nutritive substrate, the trees depend on it to develop. The soil has packed up in the cities due to the large number of tilings that do not allow the flow of water. Moreover the solid waste, residential and industrial effluents pollute and undermine the urban land.

The air quality is in danger because of  the combustion of automotive vehicles and the emission of pollutants coming from industrial activities.

Besides the function landscape, the urban tree provides benefits to the population as:
a. Protection winds
b. Reduced noise
c. Absorption of the sun
d. Shading
e. Ambiance to the birds