Desc: De kloge træer: Directed by Lasse Spang Olsen. Lasse Spang Olsen takes a closer look at whether trees can communicate with each other - whether trees and plants have a form of intelligence and - whether music and sounds influence plant growth .. and if it does: what type of music do they like the most. We're going to Israel and Germany and follow some of the researchers in the world who are at the forefront of research in plant communication and we are joining a Danish tree healer in the forest for some tree hugging.