A Reforestation project enforcing the Filipino community to plant indigenous trees and propagate seedlings One of the serious threats to our country's natural ecosystems is the invasion of alien tree species. It is a great concern especially for biodiversity conservation. The problem, if not properly addressed, may result to the domination of these foreign species and may eventually annihilate the countries' native tree species, severely damaging our forest ecosystems that serve as habitats to a great diversity of plant and animal life.