KORONADAL CITY - About 20,000 trees have been simultaneously planted by more than 14,000 individuals during Koronadal City's 5th Tree Growing Festival Monday, officials said.Most of those who participated in the activity were students and government workers in the city, according to Mayor Peter Miguel.Miguel said he really appreciated the determination of the volunteers who walked for kilometers, crossed rivers and climb hills to plant a tree for the generation to come.The recent flash floods that hit the city, damaged roads, destroyed bridges and inundated low lying areas served as an insp