Trees also raise children. Parents spread branches overhead of young trees to block light. Because they grow slowly, the tissue also becomes dense and they are hard to break. Instead, nutrients are sent through the roots. Decayed trees and fallen trees also become soil that grow saplings because it is rich in nutrients due to decomposition by fungi and insects. This is an educational method humans also should follow. From "Trees' Unknown Life" written by the former Forestry Officer in Germany (translated by Kei Hasegawa).
"January 19 2019
from “Oriori no Kotoba” by Kiyokazu Washida, The Asahi Shimbun"