Fairy rings are rings of darker green that spread in lawns and turf. There may also be mushrooms growing from these rings.
Fairy rings are caused by the spreading growth of a fungal infection in the soil of lawns and turf. As the fungus spreads through the soil it releases nutrients from the soil that encourage the growth and greening of the grass. These rings will expand as the front of the infection grows. When the fungus enters its reproductive stage mushrooms, toadstools or other fruiting bodies may appear on the ring.
Fairy ring fungi cause mottling and uneven greenness of lawns and some will harm the lawn grass particularly in dry conditions when the mycelia of the fungi coat the roots of the grass.
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