When Trees start out in the wild, their life begins in an area where that type of tree is adapted to and tolerant of the conditions of that particular site. As the trees mature, the site conditions may change. People may modify the land by building houses or office buildings. The building of these structures most times take away an assortment of brush and small plants, thus altering the natural landscape.. Some trees are tolerant of these man made conditions like Oaks and Elms. The types that are not tolerant and cannot adapt only have one choice, and that is too die. (9) Another situation that may occur is the planting of young trees in an urban site. At this young age, it allows its self to become more tolerant to an environment. But, sometimes this tolerance level is not taken into consideration. Trees may be picked just because of their color or size only. This may not be the best situation, and the tree usually dies. In that case, there will be another chance to put a more tolerant tree in that area. The trees that do survive in this condition are in so much shock after being taken out of its tolerant environment, and being put in a none tolerant environment, that their limits are being pushed to the edge. When this happens, the result will be poor performance, and a non-attractive tree. These trees that are not at their peak condition are more prone to contract diseases and attract unwanted visiting insects. The trees that have problems with diseases and insects need to be sprayed often to control these problems. Whitcomb’s theory is if you plant the right tree in the right place, it does not require extensive maintenance. If the plant is healthy, it will look healthy, and require less maintenance. The plant then would look good in a particular landscape scene. But the site must be modified to fit the plant, because the plant cannot adapt to fit the site. (9)