Giant fairy ring in Pleine-Fougères

Summary

In 1990 a farmer in Pleine-Fougères found a circle of yellowed grass nearly eight metres across, with a band width of 15 to 25 centimetres. The phenomenon reappeared weeks later in a second plot. SEPRA inspected the site and commissioned soil analyses at an agronomic school in Rennes. Results identified a fungal invasion forming a fairy ring — a known biological phenomenon, though unusually large. The case was classified A: fully explained.