Rocks are essentially river rocks to large dinosaur egg rocks and even larger. Numerous gravel pits here so soil is does drain well. Very little clay in the area.
The reason for the deep drilling into the fairy ring is go well beyond just the typical 3" from core aeration and attempt to break up the fungal cycle in some manner if possible short of digging out the entire ring and reseeding.
Fungicides, soap mixtures etc.....
Every client of mine regardless of the state if the lawn scrubby to high input ....wants them gone.
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