The reasons may not be in our perception as sight, but obviously not beyond our perception completely. Otherwise, how would you feel better? A feeling is still within our perception. Right? Reality is not as our eyes make it to be. There is an actual frequency or resonance that comes off of plants, trees and nature that gives us that calming feeling. It is a resonance that is in harmony with our own resonance. All is frequency, energy is everywhere not just in physical form as you see it. I will also note the great Nikola Tesla once said: "If you want to find the secrets of the universe, think in terms of energy, frequency and vibration.”
There is so so much going on that we are unaware of. For example, a shark can sense a drop of blood from miles away underwater. The blood scent is always there, it just can not be tapped by our current perception. This world is a matrices(matrix) of energies(vibrations) moving everywhere. We must realize what we are and how we operate if we are to change and grow. If we pick up energy in-formation and give off energy in-formation then we must be biological transceivers. We communicate energy from within to without and from without to within. Therefore a key to evolution based on this hypothesis would be to expand our perceptions of the energy in-formation that is "out there" and "in here"(mind and body) so we can decode it(through the use of a language) and make sense of it. In essence, we must expand our perceptions and increase receptivity and output of positive energies all the while being a guardian at that very same time deflecting or transmuting negative energies or vibrations from coming in. Awareness then becomes another key to this equation of evolving, of becoming. More to come on these topics in the future!
Have a thoughtful day
Alex from @mediablume