In the Middle Ages various miraculous powers were ascribed to the waters, particularly in respect to curing ailments of the eyes. It has been suggested by some researchers that the waters may have been the site of earlier veneration, possibly dating back to the Iron Age. The area around the well is protected as there is a proliferation of Petasites hybridus, a plant commonly known as butterbur, so named because its leaves were commonly used to wrap butter in times past.