There is a very large Silver Birch down the road from us. We went down on the full moon to gather leaves and branches for some Birch water. It was a beautiful night, with a good wind swaying the dancing grasses in the fields. When I started reciting the Herb Swaying charm Gwyn with the north wind roared down! The Birch sang out loud! It was VERY powerful and the presence of the Andedion was palpable.