Fairy Ring

Fairy ring; a naturally formed circle of mushrooms from one and the same underground mycelium.

Also known as:
Fairy Circles
Elf Rings
Elf Circles
Pixie Rings

recognize fairy ring
Fairy rings are not only created in lawns, photo: Pethan - CC BY-SA 3.0

Fairy ring; a naturally formed circle of mushrooms from one and the same underground mycelium. The ring grows outward evenly and the inner part gradually dies off. The mushrooms develop on the outside of the mycelium. The mycelium can grow 10 to 30 cm per year.
The fungus can compact just below ground level, depriving the grass of nutrients., resulting in discoloration of the grass within the fairy ring.

Where to find

Control

Difficult to control; the underground mycelium is not easy to remove. Excavation can be done, but is not an easy job.
If a fairy ring is perceived as disturbing, carefully fertilizing the inner part of the ring can help prevent discoloration. Mow away the mushrooms and cut the grass a little higher so that the fairy circle is less visible.

Prevention

A nutrient-rich soil and good water balance help prevent mushrooms in the lawn.