"Pea plant grows inside man's lung"
In ancient beliefs, trees are carrier of soul and the antenna which connects the physical world and the metaphysical world. And also these stories are about reincarnation and enlightenment of the mankind.
These beliefs based on the lifecycle which happens in everyday life; human being borns, grows up, gets old and finally dies and goes under the earth and the earth gives life to the other species by using this source. And life keeps going on this way.
"We breathe in what trees breathe out, and they breathe in what we breathe out. We are nature."