Although not mentioning Flower Essences as such, this amazing video from the University of Stuttgart talks about how there is a visible and uniquely identifiable change in the structure of water when a flower is placed in it, how the water holds that information and how we take that information in when we take in the water.
Flower Essences are made by placing fresh flowers into water which is what they do in the video.
We already know that Flower Essences are amazing so it's great to see some science that confirms they have a real effect.