I had not only fairy rings, but in 2000, for no reason I can see,
mushrooms upon mushrooms growing in the yard, all different kinds.
I harvested gallon jug after gallon jug of them, keeping the yard
puppy-safe for a puppy-who-eats-everything.
Neither before nor afterwards has that happened. The yard has been
undisturbed since 1973. Maybe it's a 27 year mushroom genre.
It was a cornfield before that.
The fairy rings sort of expand and die out. They produce interesting
episodes when you cut your lawn, as a hobby, with a scythe, as the
taller greener grass they create fall over in a very satisfying way
when you get to one of them.
I suppose you could suppress the rings by adding lots of nitrogen
to the lawn, so it's green all over.
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