Although this sounds rather magical Fairy Rings can have a lasting and damaging effect on the soil in your lawn.
There are three grades of fairy Rings and they are caused by organic matter rotting down underneath the grass, usually wooded material.
- Grade 3 is noticeable for a ring in the lawn which is darker than the surrounding sward, generally this grade is not damaging and can ‘blend in’ after an application of fertiliser.
- Grade 2 will begin with toadstools and fungus growing inside of the Grade 3 ring.
- Grade 1 is the browning and death of the grass, still in a ring shape. At this stage the soil will be contaminated with fungal spores making it unable to retain moisture, this is what will be causing the brown dead grass.
There may be some merit in applying a penetrative wetting agent directly to the soil but this will only slow the inevitable die-back. The best course of action is to remove the effected and the surrounding soil, replacing it with new top soil and seeding or turfing. Big job but worth to achieve a perfect lawn.