The method of collection of the medicinal herbs is sometimes as important as preparing the medicine.A small prayer of thanks is said along with a request to heal the person who uses it .This being only logical - Gratitude is a fine virtue to possess and it would be most rude to pull a branch from a life form however primitive it is considered to be.
This extract from the book " The kingdom of Faerie " by Geoffrey Hodson explains more about the tree's state of consciousness.
The author is a famous philosopher , clairvoyant and Theosophist who published many articles for the Theosophical society.
A tree may be regarded as having a soul, because a portion of the monad-bearing life-wave pervades it, and,evolves by means of incarnation within it; its evolution is quickened when a nature-spirit takes charge of a tree.
The first effect is the quickening of responsiveness in the dreaming consciousness of the tree.
The nature-spirit, being so much more highly evolved, appears also to act as a link, or channel, for energies from higher levels of
consciousness, and so fulfils a function.