Vicariance and dispersal are the major events of plant dissemination. The event of vicariance was resulted by the disposition of land mass. As comparison to vicariance, dispersal event is conducted through the wind, water, and animals. These two occasions have been used to formulate the affinity, boundaries, and traits of vegetation which lead to the establishment of plant phytogeograpy units.

Plant dissemination events have been aided by human interference due to the growing size and number of urban areas and the transformation of land usages. As the consequence, for example, trees those greening the roadsides, beautify the parks, and adorn the gardens are largely the foreign ones. In addition, these foreign trees are often appeared on the deliberate items such as bank notes and stamps to commemorate their presence. There are two main concerns on the occurrence of foreign trees are: their life habit and the planting practices.

The enlargement of urban areas is run parallel with urbanization that caused some changes in demographical patterns. On the other hand, the augment of city size and population is followed by the large entry of foreign trees in many countries. Some adaptations of life style need to be formed in accordance to these well organised man-made configurations. These associations have altered the civilians from their social, culture, and environment origins. With this circumstance, the civilian is forced to be uprooted from their essential customary which lead to some complications in assessing the usefulness and non-usefulness of necessitates and deeds. Subject to vegetation and plants, the later generation may easily misplace or lost the ability in recognizing the local ecosystem, common fruits, and traditional foods. For illustration, when Tabebuia pentaphylla was introduced, the tree was called either Tecoma or Tabebuia. Indeed, Tecoma is vernacular name at its origin land. However, since last year, the civilians have called the tree as Sakura. It seems only very small number of civilian aware on this misleading identification. The other caution is the willingness and the eagerness to adopt the foreign plants as their presence is up to 90% or more in the cities. This large diversity has conditioned the affectionate feeling toward the foreign plants and lack of comparable appreciation towards the locals.

The ecological and biological aspects of the foreign trees are minutely known. For instance, in 1970s, Acacia auriculiformis was planted as roadside tree in Indonesia. At the same time, its sister species - Acacia mangium took place as the most favorable species to be planted for pulp and paper industries. Years later, it was discovered that the two species are notoriously invasive on their new lands and particularly known for their ability to drain the nutrients and water from the soil. Moreover, with the practice of monoculture planting, Acasia mangium caused further ecological catastrophe on large surface for instance in Sumatra.

Our ecosystem is already in severe stage. To deal with this situation requires some knowledge of the previous vegetation of the respected area. The use of local tree is the most empirical way to prevent the subsequent complexity. In addition, the use of local tree provides a through direction of the ecological assessments. Subject to the man-made environments, the large spaces of urban areas will be more noteworthy when they are transformed into ex-situ vicinity. It is well understood that almost impossible to restore the lost of culture, habit, and habitat. However, the re-introduction of local plants into urban areas will make available an artificial skill to civilians to compare the differences between local trees and non local trees. Hopefully, it may offer encouragement and eagerness in discovering the equally attractive and advantageous plants. Furthermore, it is possibly unattainable to refurbish the misplaced socio-cultural. However, the idea of embracing the local trees can be a straightforward approach in bonding the community.