thanks john. I imagine as every living thing has an aura, that is what you are seeing.
the feeling I get when looking at a growing plant is of astral beams streaming upward, and hope and optimism and freshness and beauty
th opposite when observing something decaying it seems to be streaming downward below earth surface I am sure each of these two has a correlating sound or eurythmy gesture and a colour? does anyone know?

Gestures in nature
You are no doubt aware that - among other functions - I am a eurythmist.
For the eurythmical observer nature is a full of visible speech and song. The natural world moves and grows in eurythmy gestures. In fact where there appear to be none, it is probably just that we do not recognise them. I am continuing with the observations to look for what you describe. If I can sense those gestures I may be able to recognise them...
Regarding my question - I had discounted the aura explanation as it appears as a purely visual sensory phenomenon, although I cannot see it clearly on photos. For lack of a local expert I needed a second opinion.
Thank you.