There are several generally interesting and loosely held theories among herbalists. One is the Doctrine of Signatures, in which plants resemble in some way the part of the body or organ for which they will be most helpful. A quick example would be a walnut which, when cracked open resembles the brain and contains brain nourishing oil and nutrients.
I first heard about this during a conference over 20 years ago and truly wish I could remember the herbalist who gave the talk. She had a serious disease and when poke weed grew ever closer to her door, she decided to try using it - with great success.
Over the years I've been involved in many discussions about how this works, if it works, etc. Basically, we know plants have intelligence, but what other things influence the travel of herb plants? Animals, birds, and weather are just a few. I currently have poke weed trying to get IN my door, but at the same time raspberries, jewelweed, and poison ivy are fighting over the cellar window, so it's confusing.
I know that because it is nearly impossible for me to stay awake past 11 pm, life is good, and I much prefer days that include a cat nap. You can't just ignore good medicine, though. Even if it is in smallish quantities, it must be harvested - just in case.
These kind of things would have been far more helpful when life was more like a roller-coaster. Oh... I get it! Maybe they are here for the younger folks living here! Yes. Let's go with that.